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 Other income and interest from real estate transactions Interest Income, Other Total revenues Revenues Expenses: Costs and Expenses [Abstract] General and administrative General and Administrative Expense Finance restructuring costs Recapitalization Costs Property costs Cost of Property Repairs and Maintenance Real estate acquisition costs Acquisition Costs, Period Cost Interest Interest Expense Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Impairments Impairment Expense Impairment Expense Total expenses Costs and Expenses (Loss) income from continuing operations before other income (expense) and income tax expense Operating Income (Loss) Other income (expense): Other Income and Expenses [Abstract] Gain (loss) on debt extinguishment Gains (Losses) on Extinguishment of Debt Total other income (expense) Nonoperating Income (Expense) (Loss) income 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) income 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] (Loss) income from discontinued operations Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Gain on disposition of assets Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Income from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent (Loss) income before gain (loss) on disposition of assets Net Income (Loss) before Gain (Loss) on Dispositions of Assets Net Income (Loss) before Gain (Loss) on Dispositions of Assets Gain (loss) on disposition of assets Gain (Loss) on Disposition of Assets Net income (loss) attributable to common stockholders Net Income (Loss) Attributable to Parent Net income (loss) per share of common stock—basic: Earnings Per Share, Basic [Abstract] Continuing operations (in USD per share) Income (Loss) from Continuing Operations, Per Basic Share Discontinued operations (in USD per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Net income (loss) per share attributable to common stockholders—basic (in USD per share) Earnings Per Share, Basic Net income (loss) per share of common stock—diluted: Earnings Per Share, Diluted [Abstract] Continuing operations (in USD per share) Income (Loss) from Continuing Operations, Per Diluted Share Discontinued operations (in USD per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Net income (loss) per share attributable to common stockholders—diluted (in USD per share) Earnings Per Share, Diluted Weighted average shares of common stock outstanding: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Dividends declared per common share issued (in USD per share) Common Stock, Dividends, Per Share, Declared 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] 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] Convertible Notes Convertible Notes Payable [Member] Unsecured fixed rate promissory note Unsecured Debt [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Weighted Average Weighted Average [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Weighted Average Effective Interest Rates Debt Instrument, Interest Rate, Effective Percentage Weighted Average Stated Rates Debt Instrument, Interest Rate, Stated Percentage Weighted Average Term Debt Instrument, Term Total debt, gross Long-term Debt, Gross Debt discount, net Debt Instrument, Unamortized Discount (Premium), Net Deferred financing costs, net Deferred Finance Costs, Net Total debt, net Long-term Debt Accounting Policies [Abstract] 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] Allowance for Doubtful Accounts Provision For Doubtful Accounts Policy [Policy Text Block] Provision For Doubtful Accounts. 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] Line of Credit Facility [Table] Line of Credit Facility [Table] Unsecured Debt Line of Credit Line of Credit [Member] Revolving Credit Facility Revolving Credit Facility [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Swingline Loans Bridge Loan [Member] Letters of Credit Letter of Credit [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Minimum Minimum [Member] Maximum Maximum [Member] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Special Purpose Entity Special Purpose Entity [Member] Special Purpose Entity [Member] 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 Line of credit facility, accordion feature, increase limit Line Of Credit Facility, Accordion Feature, Increase Limit Line Of Credit Facility, Accordion Feature, Increase Limit 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 Origination costs Debt Issuance Cost Unamortized deferred financing costs Unamortized Debt Issuance Expense Amount outstanding Long-term Line of Credit Letters of credit issued Letters of Credit Outstanding, Amount Line of credit facility remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Debt extinguishment costs Extinguishment of Debt, Amount Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Nonrecurring Fair Value, Measurements, Nonrecurring [Member] Fair Value, Hierarchy [Axis} Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] 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] Long-lived assets held and used Long Lived Assets Held And Used Fair Value Disclosure Long Lived Assets Held And Used Fair Value Disclosure Long-lived assets held and used Intangible Lease Assets Fair Value Disclosure Intangible Lease Assets Fair Value Disclosure Lease intangible assets Assets Held-for-sale, Long Lived, Fair Value Disclosure Long-lived assets held and used, Dispositions Disposed Long Lived Assets Held For Used Fair Value Disclosure Disposed Long Lived Assets Held For Used Fair Value Disclosure Lease intangible assets, Dispositions Disposed Lease Intangible Assets Fair Value Disclosure Disposed Lease Intangible Assets Fair Value Disclosure Long-lived assets held for sale, Dispositions 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 Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Debt Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Debt Maturities Schedule of Maturities of Long-term Debt [Table Text Block] Summary of Components of Interest Expense Related to Borrowings Schedule Of Interest Expense On Debt [Table Text Block] Schedule Of Interest Expense On Debt. Derivative Instruments and Hedging Activities Disclosure [Abstract] Summary of Notional Amount and Fair Value of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Summary of Amounts Recorded in AOCL Derivative Instruments, Gain (Loss) [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 [Axis] 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] Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Owned Properties Wholly Owned Properties [Member] Financed Properties Financed Properties [Member] Financed Properties [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 properties Real Estate Investment Property Gross Real Estate Investment Property Gross Number of real estate properties Number of Real Estate Properties Gross investment in real estate, percentage Real Estate Property Investment, Unsecured, Gross, Percentage Real Estate Property Investment, Unsecured, Gross, Percentage Number of owned real estate properties Number Of Investment Securities Number Of Investment Securities Securing mortgage properties, percentage Real Estate Property Investment, Secured, Gross, Percentage Real Estate Property Investment, Secured, Gross, Percentage Securing mortgage properties Number Of Securing Mortgage Receivable Properties Number Of Securing Mortgage Receivable Properties Earnings Per Share [Abstract] Schedule of Reconciliation of the Numerator and Denominator Used in the Computation of Basic and Diluted Income Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Investments in and Advances to Affiliates, Schedule of Investments [Abstract] Remainder of 2015 Operating Leases, Future Minimum Payments Receivable, Current 2016 Operating Leases, Future Minimum Payments Receivable, in Two Years 2017 Operating Leases, Future Minimum Payments Receivable, in Three Years 2018 Operating Leases, Future Minimum Payments Receivable, in Four Years 2019 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 Statement of Comprehensive Income [Abstract] Net income (loss) attributable to common stockholders Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in net unrealized gains (losses) 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 income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Extinguishment of Debt [Axis] Extinguishment of Debt [Axis] Extinguishment of Debt, Type [Domain] Extinguishment of Debt, Type [Domain] Mortgages Net-lease Mortgage Notes Net-lease Mortgage Notes [Member] Net-lease Mortgage Notes [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] CMBS Loans CMBS Loans [Member] CMBS Loans [Member] Amount of debt defeasance Weighted average contractual interest rate Debt, Weighted Average Interest Rate Net loss on debt extinguishment Reduction of debt Repayments of Debt Proceeds from sale of properties Proceeds from Sale of Real Estate Number of properties disposed of during period Number Of Properties Disposed Number Of Properties Disposed 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] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2015-03 Accounting Standards Update 2015-03 [Member] Accounting Standards Update 2015-03 [Member] New Accounting Pronouncement, Early Adoption [Axis] New Accounting Pronouncement, Early Adoption [Axis] New Accounting Principles, Early Adoption [Domain] New Accounting Principles, Early Adoption [Domain] Adjustments for New Accounting Principle, Early Adoption Adjustments for New Accounting Principle, Early Adoption [Member] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Net assets Assets Net liabilities Liabilities Amount of reclassification of unamortized deferred financing costs now included as reduction of debt Prior Period Reclassification Adjustment Number of segments Number of Operating Segments Reserves for uncollectible amounts Allowance for Doubtful Accounts Receivable Accounts receivable Accounts Receivable, Gross Provision for losses Allowance for Doubtful Rental Revenue Receivable Allowance for Doubtful Rental Revenue Receivable Deferred rental revenue receivables Accrued Rental Revenue Receivables Accrued Rental Revenue Receivables Provision for income taxes Current Federal Tax Expense (Benefit) Schedule of Real Estate Properties [Table] Schedule of Real Estate Properties [Table] Real Estate Properties [Line Items] Real Estate Properties [Line Items] Number of Properties Number of Real Estate Properties Owned [Roll Forward] Number of Real Estate Properties Owned [Roll Forward] Gross balance, December 31, 2014 Acquisitions/improvements Number Of Real Estate Properties Acquisitions Improvements Number of Real Estate Properties Acquisitions Improvements Dispositions of real estate Number of Real Estate Properties, Disposed Number of Real Estate Properties, Disposed 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 Write off of gross lease intangibles Number of Real Estate Properties Write Off Number of Real Estate Properties Write Off 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 Gross balance, June 30, 2015 Dollar Amount of Investments, net Real Estate and Loan Activity [Roll Forward] Real Estate and Loan Activity [Roll Forward] Gross balance, December 31, 2014 Acquisitions/improvements Real Estate Investment Property At Cost Acquisitions Improvements Real Estate Investment Property At Cost Acquisitions Improvements Dispositions of real estate Real Estate Investment Property At Cost, Disposal Real Estate Investment Property At Cost, Disposal 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 Write off of gross lease intangibles Impairment of Intangible Assets, Finite-lived 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 Gross balance, June 30, 2015 Accumulated depreciation and amortization Accumulated Depreciation And Amortization Accumulated Depreciation And Amortization Other non-real estate assets held for sale Investments, Held-For-Sale Investments, Held-For-Sale Net balance, June 30, 2015 Real Estate Investments, Net Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Discontinued Operations and Disposal Groups [Abstract] Summary of Results of Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Investments Investments in and Advances to Affiliates, Schedule of Investments [Text Block] Schedule of Restricted Cash and Escrow Deposits Schedule of Restricted Cash and Cash Equivalents [Table Text Block] Commitments and Contingencies Disclosure [Abstract] 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 Number of tenants indemnified by Number Of Tenants Indemnified By Number Of Tenants Indemnified By Scheduled Principal Payments For Borrowings [Table] Scheduled Principal Payments For Borrowings [Table] Scheduled Principal Payments For Borrowings [Table] Mortgages and Notes Payable Mortgages And Notes Payable [Member] Mortgages And Notes Payable [Member] Debt Payment Type [Axis] 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] Scheduled Principal Payments For Borrowings [Line Items] Scheduled Principal Payments For Borrowings [Line Items] Scheduled Principal Payments For Borrowings [Line Items] Remainder of 2015 Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2016 Long-term Debt, Maturities, Repayments of Principal in Year Two 2017 Long-term Debt, Maturities, Repayments of Principal in Year Three 2018 Long-term Debt, Maturities, Repayments of Principal in Year Four 2019 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five 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 Interest expense associated with non-utilization fees Debt Instrument, Unused Borrowing Capacity, Fee Master Trust 2014 notes Series 2014 Notes [Member] Series 2014 Notes [Member] Master Trust 2013 notes Series 2013 Notes [Member] Series 2013 Notes [Member] Number of properties securing borrowings Debt Instrument, Number of Properties Securing Borrowings Debt Instrument, Number of Properties Securing Borrowings 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 Leases Above Market Lease [Member] Above Market Lease [Member] Below-Market Leases Below Market Lease [Member] Below 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 Intangible lease liabilities, gross Intangible Lease Liabilities Gross Intangible Lease Liabilities Gross Less: accumulated amortization Accumulated Amortization Of Intangible Lease Liabilities Accumulated Amortization Of Intangible Lease Liabilities Intangible lease liabilities, net Intangible Lease Liabilities Intangible Lease Liabilities Investment [Table] Investment [Table] Texas Texas [Member] Texas [Member] Secured Debt Secured Debt [Member] Loan Status [Axis] Loan Status [Axis] Loan Status [Axis] Loan Status [Domain] Loan Status [Domain] Loan Status [Domain] Notes Notes [Member] Notes [Member] Investment [Line Items] Investment [Line Items] 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 other notes receivable Financing Receivable, Contracts Not Secured By Real Estate, Number Financing Receivable, Contracts Not Secured By Real Estate, Number Notes receivable Financing Receivable, Net Allowance for loan losses Allowance for Loan and Lease Losses, Real Estate Number of mortgages or notes on nonaccruals status Number Of Loans On Non Accrual Status Number Of Loans On Non Accrual Status 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 Leases amortization expenses Intangible Lease Assets Amortization Expense Intangible Lease Assets Amortization Expense Risks and Uncertainties [Abstract] Significant Credit and Revenue Concentration Significant Credit And Revenue Concentration Disclosure [Text Block] Significant Credit and Revenue Concentration Disclosure. Equity [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Statement of Cash Flows [Abstract] Operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) attributable to common stockholders Adjustments to reconcile net income (loss) attributable to common stockholders 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 Derivative net settlements, amortization and other interest rate hedge losses Amortization of Interest Rate Hedge Losses and Other Derivative Losses Amortization of Interest Rate Hedge Losses and Other Derivative Losses Amortization of debt discounts (premiums) Amortization of Debt Discount (Premium) Stock-based compensation expense Share-based Compensation (Gain) loss 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, net 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 of real estate Payments to Acquire and Develop Real Estate Capitalized real estate expenditures Increase (Decrease) in Lease Acquisition Costs Investments in loans receivable Payments to Acquire Loans Receivable 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 net sales proceeds (to) from restricted accounts pursuant to 1031 Exchanges Transfer Of Net Sales Proceeds From (To) Restricted Accounts Transfer Of Net Sales Proceeds From (To) Restricted Accounts Transfers of net sales proceeds from (to) Master Trust Release Transfer Of Net Sales Proceeds From (To) Master Trust Release Transfer Of Net Sales Proceeds From (To) Master Trust Release 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 Revolving Credit Facilities Proceeds from Lines of Credit Repayments under Revolving Credit Facilities Repayments of Lines of Credit Borrowings under Convertible Notes 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 Notes 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 Dividends paid/distributions to equity owners Payments of Ordinary Dividends, Common Stock Transfers from (to) reserve/escrow deposits with lenders Transfers To (From) Escrow Deposits With Lenders Transfers To (From) Escrow Deposits With Lenders Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Net (decrease) increase 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 Summary of Real Estate and Loan Activity, Net of Accumulated Depreciation and Amortization Schedule Of Gross Real Estate And Loans Activity [Table Text Block] Schedule of Gross Real Estate and Loans Activity. Schedule of Minimum Future Contractual Rent to be Received Operating Leases of Lessee Disclosure [Table Text Block] Schedule of Loans Receivable, Net of Premium Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Lease Intangible Assets and Liabilities, Net of Accumulated Amortization Schedule of Capital Leased Assets [Table Text Block] Schedule of Components of Real Estate Investments Held Under Direct Financing Leases Investments in Direct Financing Leases Schedule [Table Text Block] Investments in Direct Financing Leases Schedule [Table Text Block] Schedule of Activity in Real Estate Assets Held for Sale Schedule of Real Estate Properties [Table Text Block] Schedule of Reconciliation of Major Classes of Assets and Liabilities from Discontinued Operations Summary of Total Impairment Losses Recognized Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block] Compensation and Retirement Disclosure [Abstract] Incentive Award Plan Compensation and Employee Benefit Plans [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 investments, net Real Estate Investment Property, Net Loans receivable, net Loans Receivable, Net Real estate assets under direct financing leases, net Capital Leases, Net Investment in Direct Financing Leases 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 Mortgages and notes payable, net Debt, Long-term and Short-term, Combined Amount Convertible Notes, net Convertible Notes Payable Total debt, net 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 7) Commitments and Contingencies Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.01 par value; 442,047,125 issued shares and 441,512,923 outstanding shares at June 30, 2015 and 411,824,039 issued shares and 411,350,440 outstanding shares at December 31, 2014 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 Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Interest rate swaps financial liabilities Derivative Liability Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Financial Liabilities at Fair Value on Recurring Basis Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Schedule of 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] Supplemental Cash Flow Elements [Abstract] Schedule of Supplemental Cash Flow Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Summary of Dividends Declared Dividends Declared [Table Text Block] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Continuing Operations Continuing Operations [Member] Discontinued Operations Discontinued Operations [Member] 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, 2014 Number Of Real Estate Properties Held For Sale 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 Number Of Real Estate Properties Held For Sale Transfers From Real Estate Investments Sales 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, 2015 Carrying Value Real Estate Assets Held-for-sale [Roll Forward] Real Estate Assets Held-for-sale [Roll Forward] Balance, December 31, 2014 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 Real Estate Held For Sale Sales During Period Real Estate Held For Sale Sales During Period Balance, June 30, 2015 Reduction of debt through sale of certain real estate properties Notes Reduction Reduction of debt in exchange for collateral assets Note Reduction Through Surrender to Lender Note Reduction Through Surrender to Lender Net real estate and other collateral assets surrendered to lender Contribution of Property Accrued interest capitalized to principal Interest Costs Capitalized Accrued performance share dividend rights Dividends Payable, Performance Shares Dividends Payable, Performance Shares Accrued equity offering costs Accrued Equity Offering Costs Accrued Equity Offering Costs Accrued deferred financing costs Accrued Deferred Offering Costs Accrued Deferred Offering Costs Estimated forfeitures for dividends declared on employee restricted stock awards Restricted Stock Award, Forfeitures, Dividends Income (Loss) Per Share Earnings Per Share [Text Block] 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 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 on dispositions of assets Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Carrying Value Reported Value Measurement [Member] Estimated Fair Value Fair Value, 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