Investments in and Advances to Affiliates, Schedule of Investments [Abstract] Minimum lease payments receivable Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received Estimated residual value of leased assets Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property Unearned income Capital Leases, Net Investment in Direct Financing Leases, Deferred Income Total Capital Leases, Net Investment in Direct Financing Leases Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Cash Flow Hedging Cash Flow Hedging [Member] Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Interest Rate Swap Interest Rate Swap [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest Expense Interest Expense [Member] General and Administrative Expense General and Administrative Expense [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Amount of (Loss) or Gain Recognized in AOCL on Derivative (Effective Portion) Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Amount of Loss Reclassified from AOCL into Operations (Effective Portion) Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion Amount of Gain or (Loss) Recognized in Operations on Derivative (Ineffective Portion) Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Convertible Senior Notes Convertible Notes Payable [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Convertible Senior Notes Due 2019 Convertible Senior Notes Due 2019 [Member] Convertible Senior Notes Due 2019 [Member] Convertible Senior Notes Due 2021 Convertible Senior Notes Due 2021 [Member] Convertible Senior Notes Due 2021 [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Mortgages and Notes Payable Mortgages And Notes Payable [Member] Mortgages And Notes Payable [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Aggregate principal amount of debt Debt Instrument, Face Amount Weighted average stated interest rate Debt Instrument, Interest Rate, Stated Percentage Conversion rate Debt Instrument, Convertible, Conversion Ratio Conversion price Debt Instrument, Convertible, Conversion Price Premium above public offering price Debt Instrument, Convertible, Premium Above Public Offering Price, Percent Debt Instrument, Convertible, Premium Above Public Offering Price, Percent Discount amortization period Debt Instrument, Convertible, Remaining Discount Amortization Period Value of the embedded conversion premium, included in net debt (discount) Debt Instrument, Unamortized Discount Deferred finance costs Deferred Finance Costs, Net Earnings Per Share [Abstract] Loss Per Share Earnings Per Share [Text Block] Fair Value Disclosures [Abstract] Financial Assets and Liabilities at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Assets at Fair Value on Nonrecurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Schedule Of Carrying Amount And Estimated Fair Value Of Financial Instruments Schedule Of Carrying Amount And Estimated Fair Value Of Financial Instruments [Table Text Block] Schedule Of Carrying Amount And Estimated Fair Value Of Financial Instruments [Table Text Block] Debt Debt Disclosure [Text Block] Number of Properties Owned or Financed Number of Real Estate Properties Owned [Roll Forward] Number of Real Estate Properties Owned [Roll Forward] Balance, December 31, 2013 Number of Real Estate Properties Acquisitions/improvements Number Of Real Estate Properties Acquisitions Improvements Number of Real Estate Properties Acquisitions Improvements Dispositions of real estate (Note 11) Number Of Real Estate Properties Dispositions Number Of Real Estate Properties Dispositions Principal payments and payoffs Number Of Real Estate Properties Principal Payment Number of Real Estate Properties Principal Payment Impairments Number Of Real Estate Properties Impairments Number of Real Estate Properties Impairments Loan premium amortization and other Number Of Real Estate Properties Loan Premium Amortization And Other Number of Real Estate Properties Loan Premium Amortization And Other Balance, June 30, 2014 Dollar Amount of Investments Real Estate and Loan Activity [Roll Forward] Real Estate and Loan Activity [Roll Forward] Balance, December 31, 2013 Real Estate Investment Property Gross Real Estate Investment Property Gross Acquisitions/improvements Real Estate Investment Property At Cost Acquisitions Improvements Real Estate Investment Property At Cost Acquisitions Improvements Dispositions of real estate(2) (Note 11) Real Estate Investment Property At Cost Dispositions Real Estate Investment Property At Cost Dispositions Principal payments and payoffs Real Estate Investment Property At Cost Principal Payment Real Estate Investment Property At Cost Principal Payment Impairments Real Estate Investment Property At Cost Impairments Real Estate Investment Property At Cost Impairments Loan premium amortization and other Real Estate Investment Property At Cost Loan Premium Amortization And Other Real Estate Investment Property At Cost Loan Premium Amortization And Other Balance, June 30, 2014 Supplemental Cash Flow Elements [Abstract] Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value Estimate of Fair Value Measurement [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value of financial liabilities Derivative Liability Schedule of Long Lived Assets Held-for-sale [Table] Schedule of Long Lived Assets Held-for-sale [Table] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Continuing Operations [Member] Continuing Operations [Member] Long Lived Assets Held-for-sale [Line Items] Long Lived Assets Held-for-sale [Line Items] Number of Real Estate Properties Number Of Real Estate Properties Held For Sale Number of Real Estate Properties Held For Sale Rental Properties Rental Properties Number of properties in real estate assets held for sale reported in continuing operations Number Of Securing Mortgage Receivable Properties Number Of Securing Mortgage Receivable Properties Carrying value of properties in real estate assets held for sale reported in continuing operations Other Loan Receivable Carrying Value Other Loan Receivable Carrying Value Compensation and Retirement Disclosure [Abstract] Incentive Award Plan and Stock Option Plan Compensation and Employee Benefit Plans [Text Block] Revolving credit facilities Revolving Credit Facilities [Member] Revolving Credit Facilities - Credit Facility and Line of Credit [Member] Master trust notes Mortgages [Member] CMBS - fixed-rate Commercial Mortgage Backed Securities - Fixed-Rate [Member] Commercial Mortgage Backed Securities - Fixed-Rate [Member] CMBS - variable-rate Commercial Mortgage Backed Securities - Variable-Rate [Member] Commercial Mortgage Backed Securities - Variable-Rate [Member] Unsecured fixed rate promissory note Unsecured Debt [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Weighted Average Weighted Average [Member] Weighted average effective interest rates Debt Instrument, Interest Rate, Effective Percentage Long-term debt, gross Long-term Debt, Gross Unamortized net debt (discount) or premium Debt Instrument, Unamortized Discount (Premium), Net Total debt, net Long-term Debt Interest rate excluding noncash amortization of deferred financing costs and non-utilization fee Debt Instrument, Interest Rate, Effective Percentage excluding Noncash Amortization of Deferred Financing Costs and Non-utilization Fee Debt Instrument, Interest Rate, Effective Percentage excluding Noncash Amortization of Deferred Financing Costs and Non-utilization Fee Value of the embedded conversion premium, included in net debt (discount) Number of loans secured by mortgage on leased properties and related assets Debt Instrument, Number of Loans, Secured by Mortgage on Leased Properties and Related Assets Debt Instrument, Number of Loans, Secured by Mortgage on Leased Properties and Related Assets Effective percentage rate minimum Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum Effective percentage rate maximum Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum Weighted average interest rate Debt, Weighted Average Interest Rate Number of properties securing borrowings Debt Instrument, Number of Properties Securing Borrowings Debt Instrument, Number of Properties Securing Borrowings Accounting Policies [Abstract] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Special Purpose Entity Special Purpose Entity [Member] Special Purpose Entity [Member] Loan Status [Axis] Loan Status [Axis] Loan Status [Axis] Loan Status [Domain] Loan Status [Domain] Loan Status [Domain] Mortgages Notes Notes [Member] Notes [Member] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable Assets Assets Liabilities Liabilities Number of segments Number of Operating Segments Accounts receivable Accounts Receivable, Gross Provision for losses Allowance for Doubtful Rental Revenue Receivable Allowance for Doubtful Rental Revenue Receivable Accrued rental revenue receivables Accrued Rental Revenue Receivables Accrued Rental Revenue Receivables Allowance for loan losses Allowance for Loan and Lease Losses, Real Estate Loan placed on non accrual status, past due days Accruing Loans Past Due Period Accruing Loans Past Due Period Loans on non accruals status Number Of Loans On Non Accrual Status Number Of Loans On Non Accrual Status Provision for income taxes Current Federal Tax Expense (Benefit) Fair Value, Measurements, Nonrecurring Fair Value, Measurements, Nonrecurring [Member] Long-lived assets held and used Long Lived Assets Held And Used Fair Value Disclosure Long Lived Assets Held And Used Fair Value Disclosure Lease intangible assets Intangible Lease Assets Fair Value Disclosure Intangible Lease Assets Fair Value Disclosure Long-lived assets held for sale Assets Held-for-sale, Long Lived, Fair Value Disclosure Long-lived assets held and used, Disposition Disposed Long Lived Assets Held For Used Fair Value Disclosure Disposed Long Lived Assets Held For Used Fair Value Disclosure Lease intangible assets, Disposition Disposed Lease Intangible Assets Fair Value Disclosure Disposed Lease Intangible Assets Fair Value Disclosure Long-lived assets held for sale, Disposition Disposed Long Lived Assets Held For Sale Fair Value Disclosure Disposed Long Lived Assets Held For Sale Fair Value Disclosure Long-lived assets held and used, Impairment Charges Impairment Charges On Long Lived Assets Held For Use Impairment Charges On Long Lived Assets Held For Use Lease intangible assets, Impairment Charges Impairment Charges On Lease Intangible Assets Impairment Charges On Lease Intangible Assets Long-lived assets held for sale, Impairment Charges Impairment Charges On Long Lived Assets Held For Sale Impairment Charges On Long Lived Assets Held For Sale Total Impairment Charges Asset Impairment Charges Risks and Uncertainties [Abstract] Significant Credit and Revenue Concentration Significant Credit And Revenue Concentration Disclosure [Text Block] Significant Credit and Revenue Concentration Disclosure. Statement of Comprehensive Income [Abstract] Net loss Net Income (Loss) Attributable to Parent Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in net unrealized (losses) or gains on cash flow hedges Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Net cash flow hedge losses reclassified to operations Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Scheduled Principal Payments For Borrowings [Table] Scheduled Principal Payments For Borrowings [Table] Scheduled Principal Payments For Borrowings [Table] Debt Payment Type Debt Payment Type [Axis] Debt Payment Type [Axis] Debt Payment Type [Domain] Debt Payment Type [Domain] Debt Payment Type [Domain] Scheduled Principal Scheduled Principal [Member] Scheduled Principal [Member] Balloon Payment Balloon Payment [Member] Balloon Payment [Member] 2019 Two Thousand Nineteen [Member] Two Thousand Nineteen [Member] 2020 Two Thousand Twenty [Member] Two Thousand Twenty [Member] 2021 Two Thousand Twenty One [Member] Two Thousand Twenty One [Member] 2022 Two Thousand Twenty Two [Member] Two Thousand Twenty Two [Member] 2023 Two Thousand Twenty Three [Member] Two Thousand Twenty Three [Member] Scheduled Principal Payments For Borrowings [Line Items] Scheduled Principal Payments For Borrowings [Line Items] Scheduled Principal Payments For Borrowings [Line Items] Remainder of 2014 Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2015 Long-term Debt, Maturities, Repayments of Principal in Year Two 2016 Long-term Debt, Maturities, Repayments of Principal in Year Three 2017 Long-term Debt, Maturities, Repayments of Principal in Year Four 2018 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Remaining average maturity of outstanding debt Debt Instrument, Remaining Average Maturity of Debt Debt Instrument, Remaining Average Maturity of Debt Discontinued Operations and Disposal Groups [Abstract] Revenues: Disposal Group, Including Discontinued Operation, Revenue [Abstract] Disposal Group, Including Discontinued Operation, Revenue [Abstract] Rent Disposal Group, Including Discontinued Operation, Rent Revenue Disposal Group, Including Discontinued Operation, Rent Revenue Non-cash rent Disposal Group, Including Discontinued Operation, Noncash Rent Disposal Group, Including Discontinued Operation, Noncash Rent Other Disposal Group, Including Discontinued Operation, Other Revenue Disposal Group, Including Discontinued Operation, Other Revenue Total revenues Disposal Group, Including Discontinued Operation, Revenue Expenses: Disposal Group Including Discontinued Operation Aggregate Expenses [Abstract] Disposal Group Including Discontinued Operation Aggregate Expenses Abstract General and administrative Disposal Group, Including Discontinued Operation, General and Administrative Expense Property costs Disposal Group Including Discontinued Operation Property Operating Expenses Disposal Group Including Discontinued Operation Property Operating Expenses Interest Disposal Group, Including Discontinued Operation, Interest Expense Depreciation and amortization Disposal Group Including Discontinued Operation Depreciation And Amortization Expense Disposal Group Including Discontinued Operation Depreciation And Amortization Expense Impairments Disposal Group Including Discontinued Operation Asset Impairment Charges Disposal Group Including Discontinued Operation Asset Impairment Charges Total expenses Disposal Group Including Discontinued Operation Aggregate Expenses Disposal Group Including Discontinued Operation Aggregate Expenses Gain (loss) from discontinued operations before other income Income Loss From Discontinued Operations Before Interest And Other Income Income Loss From Discontinued Operations Before Interest And Other Income Other income: Discontinued Operation, Amount of Other Income (Loss) from Disposition of Discontinued Operation, Net of Tax [Abstract] Gain on debt extinguishment Disposal Group, Including Discontinued Operation, Gains (Losses) on Extinguishment of Debt Disposal Group, Including Discontinued Operation, Gains (Losses) on Extinguishment of Debt Total other income Discontinued Operation, Amount of Other Income (Loss) from Disposition of Discontinued Operations, before Income Tax Income (loss) from discontinued operations Discontinued Operation, Amount of Other Income (Loss) from Disposition of Discontinued Operation, Net of Tax Gain (loss) on dispositions of assets Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Total discontinued operations Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Income (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Number of properties disposed of during period (a) Number Of Properties Disposed Number Of Properties Disposed Number of properties disposed of, including continuing and discontinued operations Number of Properties Disposed of, Including Continuing and Discontinued Operations Number of Properties Disposed of, Including Continuing and Discontinued Operations Distributions declared and unpaid Distribution Declared Distribution Declared Reduction of debt through sale of certain real estate properties Notes Reduction Real estate properties acquired under 1031 exchange Real Estate Properties (Sold) Acquired under 1031 Exchange Real Estate Properties (Sold) Acquired under 1031 Exchange Embedded conversion premium of convertible notes Convertible Note, Equity Component Convertible Note, Equity Component Reduction of debt, net of assets surrendered to lender Note Reduction Through Surrender to Lender Note Reduction Through Surrender to Lender Accrued equity offering costs Accrued Equity Offering Costs Accrued Equity Offering Costs Accrued deferred financing costs Accrued Deferred Offering Costs Accrued Deferred Offering Costs Extinguishment of Debt [Axis] Extinguishment of Debt [Axis] Extinguishment of Debt, Type [Domain] Extinguishment of Debt, Type [Domain] Old Notes Old Notes [Member] Old Notes [Member] Net-lease Mortgage Notes Net-lease Mortgage Notes [Member] Net-lease Mortgage Notes [Member] New Notes New Notes [Member] New Notes [Member] Series 2005-1 Notes Tranche 1-A Due 2020 Series 2005-1 Notes Tranche 1-A Due 2020 [Member] Series 2005-1 Notes Tranche 1-A Due 2020 [Member] Series 2005-1 Notes Tranche A-2 Due 2020 Series 2005-1 Notes Tranche A-2 Due 2020 [Member] Series 2005-1 Notes Tranche A-2 Due 2020 [Member] Series 2006-1 Notes Due 2021 Series 2006-1 Notes Due 2021 [Member] Series 2006-1 Notes Due 2021 [Member] Series 2007-1 Notes Due 2022 Series 2007-1 Notes Due 2022 [Member] [Member] Series 2007-1 Notes Due 2022 [Member] Series 2014-1 Notes Tranche 1-A Due 2040 Series 2014-1 Notes Tranche 1-A Due 2040 [Member] Series 2014-1 Notes Tranche 1-A Due 2040 [Member] Series 2014-1 Notes Tranche A-2 Due 2040 Series 2014-1 Notes Tranche A-2 Due 2040 [Member] Series 2014-1 Notes Tranche A-2 Due 2040 [Member] Series 2014-2 Notes Due 2041 Series 2014-2 Notes Due 2041 [Member] Series 2014-2 Notes Due 2041 [Member] Series 2014-2 Notes Due 2042 Series 2014-2 Notes Due 2042 [Member] Series 2014-2 Notes Due 2042 [Member] 3.89% Series 2013-1 Class A Interest Only Three Point Eighty Nine Percent Series 2013-1 Class A Interest Only [Member] Three Point Eighty Nine Percent Series 2013-1 Class A Interest Only [Member] 5.27% Series 2013-2 Class A Amortizing Net Lease Mortgage Notes Five Point Twenty Seven Percent Series 2013-2 Class A Amortizing Net Lease Mortgage Notes [Member] Five Point Twenty Seven Percent Series 2013-2 Class A Amortizing Net Lease Mortgage Notes [Member] Series 2014 Notes Series 2014 Notes [Member] Series 2014 Notes [Member] Series 2013 Notes Series 2013 Notes [Member] Series 2013 Notes [Member] Spirit Master Funding VII, LLC Spirit Master Funding VII, LLC [Member] Spirit Master Funding VII, LLC [Member] Repurchase debt Debt Instrument, Repurchased Face Amount Long-term debt Amount of old debt notes exchanged Extinguishment of Debt, Amount Exchanged Extinguishment of Debt, Amount Exchanged Amount of debt defeasance Extinguishment of Debt, Amount Extended term of debt Debt Instrument, Extension Term Debt Instrument, Extension Term Investment [Table] Investment [Table] Real Estate Property Ownership Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Texas TEXAS Investment [Axis] Investment [Axis] Investment [Domain] Investment [Domain] Properties vacant Properties Owned [Member] Properties Owned [Member] Property Held For Sale Property Held For Sale [Member] Property Held For Sale [Member] Investment [Line Items] Investment [Line Items] Real estate properties and loans, gross Real estate assets held for sale Properties dispersed geographically Number Of States Real Estate Properties Located Number Of States Real Estate Properties Located Number of states exceeding disclosure threshold Number of States Exceeding Disclosure Threshold Number of States Exceeding Disclosure Threshold Percentage of investment in real estate properties Percentage Of Investment In Real Estate Properties Percentage Of Investment In Real Estate Properties Minimum percentage of investment in real estate properties Minimum Percentage Of Investment In Real Estate Properties Over Which Investment To Be Disclosed Minimum Percentage Of Investment In Real Estate Properties Over Which Investment To Be Disclosed Number of owned real estate properties Number Of Investment Securities Number Of Investment Securities Securing mortgage properties Securing mortgage properties carrying amount Securing Mortgage Properties Loans Receivable Carrying Amount Securing Mortgage Properties Loans Receivable Carrying Amount Other loan receivable with aggregate carrying value Accumulated depreciation and amortization associated with dispositions of real estate SEC Schedule III, Real Estate Accumulated Depreciation, Real Estate Sold Number of properties Number Of Properties Number Of Properties Fair Value Measurements Fair Value Disclosures [Text Block] Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Equity [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Basis of Accounting and Principles of Consolidation Basis Of Presentation And Principles Of Consolidation Policy [Policy Text Block] Basis Of Presentation And Principles Of Consolidation Policy. Use of Estimates Use of Estimates, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Segment Reporting Segment Reporting, Policy [Policy Text Block] Real Estate Investments Real Estate Investments Policy [Policy Text Block] Real Estate Investments Policy. Allowance for Doubtful Accounts Provision For Doubtful Accounts Policy [Policy Text Block] Provision For Doubtful Accounts. Loans Receivable Policy Loans Receivable, Policy [Policy Text Block] Restricted Cash and Escrow Deposits Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Leases [Abstract] Schedule of Capital Leased Assets [Table] Schedule of Capital Leased Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] In-place Leases In Place Leases [Member] In Place Leases [Member] Above-Market Lease Above Market Lease [Member] Above Market Lease [Member] Capital Leased Assets [Line Items] Capital Leased Assets [Line Items] Intangible lease assets, gross Intangible Lease Assets Gross Intangible Lease Assets Gross Less: accumulated amortization Accumulated Amortization Of Intangible Lease Assets Accumulated Amortization Of Intangible Lease Assets Intangible lease assets, net Intangible Lease Assets Intangible Lease Assets Below-market leases Below Market Lease, Gross Less: accumulated amortization Below Market Lease, Accumulated Amortization Intangible lease liabilities, net Below Market Lease, Net Statement of Cash Flows [Abstract] Operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Impairments Amortization of deferred financing costs Amortization of Financing Costs Amortization of interest rate hedge losses and derivative net settlements Amortization Of Interest Rate Hedge Losses And Other Derivative Losses Amortization Of Interest Rate Hedge Losses And Other Derivative Losses Amortization of debt (premiums) discounts Amortization of Debt Discount (Premium) Stock-based compensation expense Share-based Compensation Loss (gain) on debt extinguishment Gains (Losses) on Extinguishment of Debt, Continuing and Discontinued Operations Gains (Losses) on Extinguishment of Debt, Continuing and Discontinued Operations Debt extinguishment costs Payments of Debt Extinguishment Costs Gains on dispositions of real estate and other assets, net Gains (Losses) on Sales of Other Real Estate Non-cash revenue Other Noncash Income Other Other Noncash Expense Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Deferred costs and other assets Increase (Decrease) in Accounts Receivable and Other Operating Assets Accounts payable, accrued expenses and other liabilities Increase Decrease In Accounts Payable Accrued Expenses And Other Liabilities Increase Decrease In Accounts Payable Accrued Expenses And Other Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Acquisitions/investments in real estate Payments to Acquire and Develop Real Estate Collections of principal on loans receivable and real estate assets under direct financing leases Proceeds from Collection of Loans Receivable Proceeds from dispositions of real estate and other assets Proceeds From Dispositions Of Real Estate And Other Assets Proceeds From Dispositions Of Real Estate And Other Assets Transfers of sale proceeds and loan principal collections (to) from restricted account Transfers Of Sale Proceeds And Loan Principal Collections From To Restricted Account Transfers Of Sale Proceeds And Loan Principal Collections From To Restricted Account Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Borrowings under lines of credit Proceeds from Lines of Credit Repayments under lines of credit Repayments of Lines of Credit Borrowings under mortgages and notes payable Proceeds From Nonrecourse Mortgage Debt And Notes Payable Proceeds From Nonrecourse Mortgage Debt And Notes Payable Repayments under mortgages and notes payable Repayments Of Mortgage And Loans Payable Repayments Of Mortgage And Loans Payable Deferred financing costs Payment Of Deferred Financing Costs And Call Premiums Payment Of Deferred Financing Costs And Call Premiums Proceeds from issuance of common stock, net of offering costs Proceeds from Issuance of Common Stock, Net after Sales Agent Commission Proceeds from Issuance of Common Stock, Net after Sales Agent Commission Proceeds from exercise of stock options Proceeds from Stock Options Exercised Offering costs paid on equity component of convertible debt Payments of Equity Issuance Costs, Other The cash outflow for equity issuance costs not otherwise defined in the taxonomy. Purchase of treasury stock Payments for Repurchase of Common Stock Consent fees paid to lenders Payment Of Consent Fee To Lenders Payment Of Consent Fee To Lenders Dividends paid to stockholders Payments of Ordinary Dividends, Common Stock Transfers (to) from escrow deposits with lenders Transfers To (From) Escrow Deposits With Lenders Transfers To (From) Escrow Deposits With Lenders Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Mortgage - principal Loans and Leases Receivable, Gross, Consumer Mortgage - premium Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Consumer Mortgages, net Loans and Leases Receivable, Net Amount, Consumer Other notes - principal Loans and Leases Receivable, Gross, Other Total loans receivable, net Loans and Leases Receivable, Net Amount Investments Investments in and Advances to Affiliates, Schedule of Investments [Text Block] Derivative and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Net Gains or Losses from Discontinued Operations Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Investments: Investments [Abstract] Real estate investments: Real Estate Investment Property, Net [Abstract] Land and improvements Land and Land Improvements Buildings and improvements Buildings and Improvements, Gross Total real estate investments Real Estate Investment Property Real Estate Investment Property Less: accumulated depreciation Real Estate Investment Property, Accumulated Depreciation Real Estate Investment Property, Net Real Estate Investment Property, Net Loans receivable, net Loans Receivable, Net Intangible lease assets, net Real estate assets under direct financing leases, net Real estate assets held for sale, net Real Estate Held for Development and Sale, Net Net investments Investments Cash and cash equivalents Deferred costs and other assets, net Deferred Costs and Other Assets Goodwill Goodwill Total assets Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Liabilities: Liabilities [Abstract] Revolving credit facilities, net Long-term Line of Credit Mortgages and notes payable, net Debt, Long-term and Short-term, Combined Amount Convertible senior notes, net Convertible Notes Payable Intangible lease liabilities, net Below Market Leases Below Market Leases Accounts payable, accrued expenses and other liabilities Accounts Payable and Other Accrued Liabilities Total liabilities Commitments and contingencies (see Note 8) Commitments and Contingencies Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.01 par value; 399,030,681 shares issued; 398,812,745 outstanding shares at June 30, 2014 and 370,570,565 shares issued; 370,363,803 outstanding shares at December 31, 2013 Common Stock, Value, Issued Capital in excess of par value Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Treasury stock, at cost Treasury Stock, Value Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Lease Intangibles, Net Intangible Assets Disclosure [Text Block] Schedule Of Interest Expenses [Table] Schedule Of Interest Expenses [Table] Schedule Of Interest Expenses [Table] Revolving Credit Facilities Line of Credit [Member] Other Interest Expense Other Interest Expense [Member] Other Interest Expense [Member] Schedule Of Interest Expenses [Line Items] Schedule Of Interest Expenses [Line Items] Schedule Of Interest Expenses [Line Items] Interest expense Interest Expense, Debt Amortization of deferred financing costs Amortization Of Deferred Financing Costs Amortization Of Deferred Financing Costs Amortization of debt discount Total interest expense Interest Expense Outstanding claims Loss Contingency, Pending Claims, Number Total commitments Commitments To Purchase Capital Assets Commitments To Purchase Capital Assets Total commitments relating to future acquisitions Commitments to Purchase Capital Assets Relating to Future Acquisitions Commitments to Purchase Capital Assets Relating to Future Acquisitions Contingently liable amount of debt owed by tenant Contingently Liable For Guarantees Of Indebtedness Owed By Affiliates And Third Parties Contingently Liable For Guarantees Of Indebtedness Owed By Affiliates And Third Parties Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Shares Common Stock [Member] Common Stock Par Value Common Stock Including Additional Paid in Capital [Member] Capital in Excess of Par Value Capital Units [Member] Accumulated Deficit Accumulated Deficit during Development Stage [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss) [Member] Treasury Stock Treasury Stock [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance (in shares) Shares, Outstanding Beginning balance Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Dividends declared on common stock Dividends, Common Stock Repurchase of common shares (in shares) Treasury Stock, Shares, Acquired Repurchase of common shares Treasury Stock, Value, Acquired, Cost Method Issuance of common shares (in shares) Stock Issued During Period, Shares, New Issues Issuance of common shares Stock Issued During Period, Value, New Issues Embedded conversion premium of convertible notes Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Exercise of stock options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Stock based compensation, net (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock-based compensation, net Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Ending balance (in shares) Ending balance Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Subsidiary [Axis] Subsidiary [Axis] Subsidiary [Axis] Subsidiary [Domain] Subsidiary [Domain] Subsidiary [Domain] Shopko And Pamida Shopko And Pamida [Member] Shopko And Pamida Member Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Number of tenants Number Of Tenants Number Of Tenants Rental revenue in percentage of total revenue Concentration Risk, Percentage Rental revenue by combined properties operated by tenants Percentage Of Properties Operated In Relation To Investment Portfolio Percentage Of Properties Operated In Relation To Investment Portfolio Assets Disposal Group, Including Discontinued Operation, Assets [Abstract] Land and improvements Disposal Group, Including Discontinued Operation, Land and Land Improvements Disposal Group, Including Discontinued Operation, Land and Land Improvements Buildings and improvements Disposal Group, Including Discontinued Operation, Building and Building Improvements Disposal Group, Including Discontinued Operation, Building and Building Improvements Total real estate investments Disposal Group, Including Discontinued Operation, Real Estate Investments Disposal Group, Including Discontinued Operation, Real Estate Investments Less: Accumulated depreciation Disposal Group, Including Discontinued Operation, Accumulated Depreciation Disposal Group, Including Discontinued Operation, Accumulated Depreciation Intangible lease assets, net Disposal Group, Including Discontinued Operation, Intangible Assets Other Disposal Group, Including Discontinued Operation, Other Assets Total assets Disposal Group, Including Discontinued Operation, Assets Liabilities Disposal Group, Including Discontinued Operation, Liabilities [Abstract] Intangible lease liabilities, net Disposal Group, Including Discontinued Operation, Intangible Lease Liabilities, Net Disposal Group, Including Discontinued Operation, Intangible Lease Liabilities, Net Total liabilities Disposal Group, Including Discontinued Operation, Liabilities Senior Mortgage Notes Payable Senior Mortgage Notes Payable [Member] Senior Mortgage Notes Payable [Member] Subsidiaries Subsidiaries [Member] Loss on debt extinguishment Gains (Losses) on Extinguishment of Debt Computation of Basic and Diluted Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Line of credit Revolving Credit Facility Revolving Credit Facility [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Base Rate Base Rate [Member] LIBOR London Interbank Offered Rate (LIBOR) [Member] Prime Rate Prime Rate [Member] Floor Rate Floor Rate [Member] Floor Rate [Member] Minimum Minimum [Member] Maximum Maximum [Member] Deferred Charges And Other Assets Deferred Charges And Other Assets [Member] Deferred Charges And Other Assets [Member] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of credit facility maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Commitment fee on unused capacity Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Commitment fee Line of Credit Facility, Commitment Fee Amount Deferred Costs Deferred Costs Amount outstanding Maximum borrowing capacity increase Line of Credit Facility, Maximum Borrowing Capacity, Increase Line of Credit Facility, Maximum Borrowing Capacity, Increase Term Debt Instrument, Term Number of separate advances Line of Credit Facility, Number of Separate Advances Line of Credit Facility, Number of Separate Advances Remainder of 2014 Operating Leases, Future Minimum Payments Receivable, Current 2015 Operating Leases, Future Minimum Payments Receivable, in Two Years 2016 Operating Leases, Future Minimum Payments Receivable, in Three Years 2017 Operating Leases, Future Minimum Payments Receivable, in Four Years 2018 Operating Leases, Future Minimum Payments Receivable, in Five Years Thereafter Operating Leases, Future Minimum Payments Receivable, Thereafter Total future minimum rentals Operating Leases, Future Minimum Payments Receivable Lease Intangible Assets and Liabilities Schedule of Capital Leased Assets [Table Text Block] Income Statement [Abstract] Revenues: Revenues [Abstract] Rentals Operating Leases, Income Statement, Lease Revenue Interest income on loans receivable Interest Income On Loans Receivable Interest Income On Loans Receivable Earned income from direct financing leases Capital Leases, Income Statement, Direct Financing Lease Revenue Tenant reimbursement income Tenant Reimbursements Interest income and other Interest Income, Other Total revenues Revenues Expenses: Costs and Expenses [Abstract] General and administrative General and Administrative Expense Finance restructuring costs Recapitalization Costs Merger costs Business Combination, Acquisition Related Costs Property costs Cost of Property Repairs and Maintenance Real estate acquisition costs Acquisition Costs, Period Cost Interest Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Impairments (recoveries) Impairment Expense Impairment Expense Total expenses Costs and Expenses Loss from continuing operations before other expense and income tax expense Operating Income (Loss) Other expense: Other Income and Expenses [Abstract] Total other expense Nonoperating Income (Expense) Loss from continuing operations before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Loss from continuing operations Income (Loss) from Continuing Operations Attributable to Parent Discontinued operations: Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent [Abstract] Income (loss) from discontinued operations Gain (loss) on dispositions of assets Loss before dispositions of assets Net Income (Loss) before Gain (Loss) on Dispositions of Assets Net Income (Loss) before Gain (Loss) on Dispositions of Assets (Loss) gain on dispositions of assets Gain (Loss) on Disposition of Assets Net loss Net (loss) income per share of common stock—basic and diluted: Earnings Per Share, Basic and Diluted [Abstract] Continuing operations (in USD per share) Income (Loss) from Continuing Operations, Per Basic and Diluted Share Discontinued operations (in USD per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share Net loss (in USD per share) Earnings Per Share, Basic and Diluted Weighted average common shares outstanding: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Basic and Diluted (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Dividends declared per common share issued (in USD per share) Common Stock, Dividends, Per Share, Declared Summary of Notional Amount and Fair Value of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivative Instruments Amounts Recorded in AOCL and Gain or (Loss) Reclassified Out of AOCL Derivative Instruments, Gain (Loss) [Table Text Block] Dividends Declared [Table] Dividends Declared [Table] Dividends Declared [Table] Accounts payable, accrued expenses and other liabilities Accounts Payable Accruals And Other Liabilities [Member] Accounts Payable, Accruals and Other Liabilities [Member] Dividends Declared [Line Items] Dividends Declared [Line Items] [Line Items] for Dividends Declared [Table] Dividend per share (in USD per share) Dividends Dividends Basic and diluted loss: Loss from continuing operations Less: income attributable to unvested restricted stock Dilutive Securities, Effect on Basic Earnings Per Share, Restricted Stock Dilutive Securities, Effect on Basic Earnings Per Share, Restricted Stock Loss used in basic and diluted income (loss) per share from continuing operations Income Loss From Continuing Operations Attributable To Common Stockholders Income Loss From Continuing Operations Attributable To Common Stockholders Income (loss) from discontinued operations Net loss attributable to common stockholders used in basic and diluted income (loss) per share Net Income (Loss) Available to Common Stockholders, Diluted Basic and diluted weighted average shares of common stock outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average shares of common stock outstanding Weighted Average Shares Outstanding including Unvested Shares Weighted Average Shares Outstanding including Unvested Shares Less: unvested weighted average shares of restricted stock Weighted Average Shares Outstanding, Unvested Shares Adjustment Weighted Average Shares Outstanding, Unvested Shares Adjustment Weighted average number of shares outstanding used in basic and diluted loss per share Weighted Average Number of Shares Outstanding, Basic Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Unvested shares of restricted stock Restricted Stock [Member] Unvested performance shares Performance Shares [Member] Stock options Employee Stock Option [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Dilutive shares (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Document Document And Entity Information [Abstract] Document Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus (Q1,Q2,Q3,FY) Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Collateral Deposits Collateral Deposits [Member] Collateral Deposits [Member] Tenant Improvements, Repairs and Leasing Commissions Tenant Improvements, Repairs and Leasing Commissions [Member] Tenant Improvements, Repairs and Leasing Commissions [Member] Master Trust Release and Title Company Escrow Master Trust Release and Title Company Escrow [Member] Master Trust Release and Title Company Escrow [Member] Loan Impounds Loan Impounds [Member] Loan Impounds [Member] Other Restricted Cash and Escrow Deposits Other Restricted Cash and Escrow Deposits [Member] Other Restricted Cash and Escrow Deposits [Member] Restricted cash and investments Restricted Cash and Investments Real estate and intangible asset impairment Impairment of Real Estate Write-off of lease intangibles due to lease terminations Impairment of Leasehold Loans receivable recovery Loan Receivable (Recovery) Impairment Loan Receivable (Recovery) Impairment Other impairment Other Asset Impairment Charges Total impairment loss continuing and discontinued operations Derivative instruments loss estimated to be reclassified from accumulated OCI as an increase to interest expense within 12 months Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Gross Real Estate and Loan Activity Schedule Of Gross Real Estate And Loans Activity [Table Text Block] Schedule of Gross Real Estate and Loans Activity. Operating Leases of Lessee Disclosure Operating Leases of Lessee Disclosure [Table Text Block] Schedule of Loans Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Investments in Direct Financing Leases Schedule Investments in Direct Financing Leases Schedule [Table Text Block] Investments in Direct Financing Leases Schedule [Table Text Block] Activity in Real Estate Assets Held for Sale Schedule of Real Estate Properties [Table Text Block] Real Estate Assets Held for Sale in Discontinued Operations Summary of Total Impairment Losses Recognized Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Derivative Instrument Disclosure [Axis] Derivative Instrument Disclosure [Axis] Derivative Instrument Disclosure [Axis] Derivative Instrument Disclosure [Domain] Derivative Instrument Disclosure [Domain] Derivative Instrument Disclosure [Domain] Derivative Instrument 1 Derivative Instrument One [Member] Derivative Instrument 1 [Member] Derivative Instrument 2 Derivative Instrument Two [Member] Derivative Instrument 2 [Member] Derivative Instrument 3 Derivative Instrument Three [Member] Derivative Instrument 3 [Member] Derivative Instrument 4 Derivative Instrument Four [Member] Derivative Instrument 4 [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Notional Amount Derivative, Notional Amount Interest Rate Derivative, Swaption Interest Rate Fair Value of Liability Derivative Liability, Fair Value, Gross Liability Number of interest rate derivatives held Number of Interest Rate Derivatives Held Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Non-vested shares of restricted stock Performance Shares Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Directors Officers And Employees Certtain Directors, Named Executive Officers And Employees [Member] [Member] Certtain Directors, Named Executive Officers And Employees [Member] [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of shares authorized under plan (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Grants in period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Deferred compensation expense Deferred Compensation Arrangement, Compensation Expense Deferred Compensation Arrangement, Compensation Expense Outstanding non vested restricted shares (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Shares of common stock available for issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Multiplier for shares granted Share-based Payment Arrangement by Share-based Payment Award, Shares Granted, Multiplier Share-based Payment Arrangement by Share-based Payment Award, Shares Granted, Multiplier Stock-based compensation expense Allocated Share-based Compensation Expense Potential grants in period based on total shareholder return (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Potential Grants in Period Based on Total Shareholder Return Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Potential Grants in Period Based on Total Shareholder Return Dividend rights accrued Dividend Rights Payable Dividend Rights Payable Unamortized stock based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Dividends Declared Dividends Declared [Table Text Block] Schedule of Restricted Cash and Cash Equivalents Schedule of Restricted Cash and Cash Equivalents [Table Text Block] Summary Of Business And Significant Accounting Policies [Table] Summary Of Business And Significant Accounting Policies [Table] Summary Of Business And Significant Accounting Policies [Table] Partner Type Partner Type [Axis] Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] General Partner General Partner [Member] Limited Partner Limited Partner [Member] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] Secondary Offering Secondary Public Offering [Member] Secondary Public Offering [Member] Over-Allotment Option Over-Allotment Option [Member] At the Market Continuous Equity Offering [Member] Continuous Equity Offering [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Underwriters Underwriters [Member] Underwriters [Member] 2.875% Convertible Senior Notes due 2019 Two Point Eight Seven Five Percent Convertible Senior Notes Due 2019 [Member] Two Point Eight Seven Five Percent Convertible Senior Notes Due 2019 [Member] 3.75% Convertible Senior Notes due 2021 Three Point Seven Five Percent Convertible Senior Notes Due 2021 [Member] Three Point Seven Five Percent Convertible Senior Notes Due 2021 [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Current Year Acquisitions Current Year Acquisitions [Member] Current Year Acquisitions [Member] Summary Of Business And Significant Accounting Policies [Line Items] Summary Of Business And Significant Accounting Policies [Line Items] Summary Of Business And Significant Accounting Policies [Line Items] Percentage ownership of operating partnership Percentage Of Ownership Percentage Of Ownership Gross investment in real estate, percentage Real Estate Property Investment, Unsecured, Gross, Percentage Real Estate Property Investment, Unsecured, Gross, Percentage Securing mortgage properties, percentage Real Estate Property Investment, Secured, Gross, Percentage Real Estate Property Investment, Secured, Gross, Percentage Issuance of common shares (in shares) Payments for commissions Payments for Commissions Common stock, par value per share (in USD per share) Common Stock, Par or Stated Value Per Share Common stock option to purchase additional shares to cover over-allotments term Common Stock, Option to Purchase Additional Shares Common Stock, Option to Purchase Additional Shares Stated interest rate Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Proceeds from convertible debt Proceeds from Convertible Debt Percentage elected to exchange notes Extinguishment of Debt, Amount Exchanged, Percent Extinguishment of Debt, Amount Exchanged, Percent Number of indirectly owned subsidiaries that defeased loans outstanding under master loan agreement Number of Indirect Subsidiaries with Debt Extinguishment Number of Indirect Subsidiaries with Debt Extinguishment Total debt, net Gross book value of rental properties and rent Debt Instrument, Properties Securing Borrowings, Value Debt Instrument, Properties Securing Borrowings, Value Maximum authorized proceeds from issuance of common stock Maximum Proceeds from Issuance of Common Stock Maximum Proceeds from Issuance of Common Stock Number of properties acquired Number of Real Estate Properties Acquired Number of Real Estate Properties Acquired Payments to acquire real estate Payments to Acquire Real Estate Revenues Payments to Acquire Real Estate, Revenue Producing Investments Payments to Acquire Real Estate, Revenue Producing Investments Proceeds from sale of real estate Proceeds from Sale of Real Estate Number of Properties Number of Real Estate Properties Held-for-sale [Roll Forward] Number of Real Estate Properties Held-for-sale [Roll Forward] Balance, December 31, 2013 Transfers from real estate investments Number Of Real Estate Properties Held For Sale Transfers From Real Estate Investments Number Of Real Estate Properties Held For Sale Transfers From Real Estate Investments Sales (Note 11) Number Of Real Estate Properties Held For Sale Sales During Period Number Of Real Estate Properties Held For Sale Sales During Period Balance, June 30, 2014 Carrying Value Real Estate Assets Held-for-sale [Roll Forward] Real Estate Assets Held-for-sale [Roll Forward] Balance, December 31, 2013 Real Estate Held-for-sale Transfers from real estate investments Real Estate Held For Sale Transfers From Real Estate Investments Real Estate Held For Sale Transfers From Real Estate Investments Sales (Note 11) Real Estate Held For Sale Sales During Period Real Estate Held For Sale Sales During Period Balance, June 30, 2014 Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Amortization amount to rental revenue for capitalized leases Net Impact To Rental Revenues Due To Amortization Of Above And Below Market Leases Net Impact To Rental Revenues Due To Amortization Of Above And Below Market Leases Amortization amount to rental revenue for capitalized leases due to merger Net Impact to Rental Revenues Due to Amortization of Above and Below Market Leases Due to Business Combination Net Impact to Rental Revenues Due to Amortization of Above and Below Market Leases Due to Business Combination Leases amortization expenses Intangible Lease Assets Amortization Expense Intangible Lease Assets Amortization Expense Lease amortization expense due to merger Intangible Lease Assets Amortization Expense Due to Business Combination Intangible Lease Assets Amortization Expense Due to Business Combination Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Share price Share Price Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Estimated Fair Value Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Loans receivable, net Loans Receivable, Fair Value Disclosure Revolving credit facilities, net Lines of Credit, Fair Value Disclosure Mortgages and notes payable, net Notes Payable, Fair Value Disclosure Convertible senior notes, net (1) Convertible Debt, Fair Value Disclosures Value of the embedded conversion premium, included in net debt (discount) Schedule of Debt Schedule of Long-term Debt Instruments [Table Text Block] Debt Maturities of Mortgages and Notes Payable, Including Balloon Payments Schedule of Maturities of Long-term Debt [Table Text Block] Interest Expense and Related Borrowings Schedule Of Interest Expense On Debt [Table Text Block] Schedule Of Interest Expense On Debt.