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 Statement of Financial Position [Abstract] Common stock, par value per share (in USD per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Risks and Uncertainties [Abstract] Significant Credit and Revenue Concentration Significant Credit And Revenue Concentration Disclosure [Text Block] Significant Credit and Revenue Concentration Disclosure. Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] CMBS Loans CMBS Loans [Member] CMBS Loans [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] 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] Mortgages Mortgages [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Number of loans secured by mortgage on leased 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Collateral for Secured Borrowings, Number of Properties Default interest rate Debt Instrument, Debt Default, Percentage Debt Instrument, Debt Default, Percentage Debt default amount Debt Instrument, Debt Default, Amount Interest added to principal Interest Paid, Capitalized Lender controlled restricted cash Restricted Cash and Cash Equivalents Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [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] Carrying Value Reported Value Measurement [Member] Estimated Fair Value Estimate of Fair Value Measurement [Member] 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 Notes, net Convertible Debt, Fair Value Disclosures Investments in and Advances to Affiliates, Schedule of Investments [Abstract] Schedule of Real Estate Properties [Table] Schedule of Real Estate Properties [Table] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Continuing Operations Continuing Operations [Member] Discontinued Operations Discontinued Operations [Member] Real Estate Properties [Line Items] Real Estate Properties [Line Items] 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, March 31, 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, March 31, 2015 Supplemental Cash Flow Elements [Abstract] Schedule of Supplemental Cash Flow Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenues Revenues [Member] Revenues [Member] Customer [Axis] Customer [Axis] Subsidiary [Domain] Customer [Domain] Shopko Shopko [Member] Shopko [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 Investments Investments in and Advances to Affiliates, Schedule of Investments [Text Block] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] Underwriter Option Over-Allotment Option [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Issuance of common shares (in shares) Stock Issued During Period, Shares, New Issues Price per share (in USD per share) Shares Issued, Price Per Share Aggregate gross proceeds from issuance of common stock Proceeds from Issuance of Common Stock Aggregate net sales proceeds from Issuance of common stock Proceeds from Issuance of Common Stock, Net Proceeds from Issuance of Common Stock, Net Investment [Axis] Investment [Axis] Investment [Domain] Investment [Domain] Properties Vacant Properties Vacant [Member] Properties Vacant [Member] Property Held For Sale Property Held For Sale [Member] Property Held For Sale [Member] Revenue producing capitalized expenditures Payments to Acquire Real Estate, Revenue Producing Investments Payments to Acquire Real Estate, Revenue Producing Investments Capitalized maintenance expenditures Capitalized Costs, Maintenance Costs Capitalized Costs, Maintenance Costs Accumulated depreciation and amortization associated with dispositions of real estate SEC Schedule III, Real Estate Accumulated Depreciation, Real Estate Sold Number of properties sold under 1031 Exchanges Number Of Real Estate Properties Sold Under 1031 Exchange Number Of Real Estate Properties Sold Under 1031 Exchange Amount of properties sold under 1031 Exchanges Real Estate Properties Sold Under 1031 Exchange Real Estate Properties Sold Under 1031 Exchange Amount of properties acquired under 1031 Exchanges Real Estate Properties Acquired Under 1031 Exchange Real Estate Properties Acquired Under 1031 Exchange Number of properties acquired under 1031 Exchanges Number Of Real Estate Properties Acquired Under 1031 Exchange Number Of Real Estate Properties Acquired Under 1031 Exchange Number of properties Number Of Properties Number Of Properties Accounting Policies [Abstract] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] 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 Master Trust Release [Member] Master Trust Release [Member] Title Company Escrow Title Company Escrow [Member] 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] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Restricted cash and investments Restricted Cash and Investments Fair Value Measurements Fair Value Disclosures [Text Block] 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 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 Net assets Disposal Group, Including Discontinued Operation, Assets, Net Disposal Group, Including Discontinued Operation, Assets, Net 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] 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 Master Trust 2014 notes Series 2014 Notes [Member] Series 2014 Notes [Member] Master Trust 2013 notes Series 2013 Notes [Member] Series 2013 Notes [Member] Extinguishment of Debt [Axis] Extinguishment of Debt [Axis] Extinguishment of Debt, Type [Domain] Extinguishment of Debt, Type [Domain] Amount of debt defeasance Extinguishment of Debt, Amount Weighted average contractual interest rate Debt, Weighted Average Interest Rate Net gain (loss) on debt extinguishment Gains (Losses) on Extinguishment of Debt Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Unvested performance shares Unvested Performance Shares [Member] Unvested Performance Shares [Member] Stock options Employee Stock Options [Member] Employee Stock Options [Member] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Unvested shares of restricted stock Restricted Stock [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Basic and diluted earnings: Earnings Per Share, Basic and Diluted [Abstract] Income from continuing operations Income (Loss) from Continuing Operations Attributable to Parent Gain on dispositions of assets Gain (Loss) on Disposition of Assets 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 Income used in basic and diluted income per share from continuing operations Income Loss From Continuing Operations Attributable To Common Stockholders Income Loss From Continuing Operations Attributable To Common Stockholders Income from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net income attributable to common stockholders used in basic and diluted income per share Net Income (Loss) Available to Common Stockholders, Diluted Basic weighted average shares of common stock outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Weighted average shares of common stock outstanding (in shares) Weighted Average Shares Outstanding including Unvested Shares Weighted Average Shares Outstanding including Unvested Shares Less: unvested weighted average shares of restricted stock (in shares) Weighted Average Shares Outstanding, Unvested Shares Adjustment Weighted Average Shares Outstanding, Unvested Shares Adjustment Weighted average number of shares outstanding used in basic income (loss) per share (in shares) Weighted Average Number of Shares Outstanding, Basic Dilutive weighted average shares of common stock Weighted Average Number of Shares Outstanding, Diluted [Abstract] Dilutive weighted average share of common stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted average number of shares of common stock used in dilutive income (loss) per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Dilutive shares (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Master Trust Notes Series 2014-1 Class A1 Series 2014-1, Class A1 Notes [Member] Series 2014-1, Class A1 Notes [Member] Series 2014-1 Class A2 Series 2014-1, Class A2 Notes [Member] Series 2014-1, Class A2 Notes [Member] Series 2014-2 Series 2014-2 Notes [Member] Series 2014-2 Notes [Member] Series 2014-3 Series 2014-3 Notes [Member] Series 2014-3 Notes [Member] Series 2014-4 Class A1 Series 2014-4, Class A-1 Notes [Member] Series 2014-4, Class A-1 Notes [Member] Series 2014-4 Class A2 Series 2014-4, Class A-2 Notes [Member] Series 2014-4, Class A-2 Notes [Member] Total Master Trust 2014 notes Series 2013-1 Class A Series 2013-1, Class A Notes [Member] Series 2013-1, Class A Notes [Member] Series 2013-2 Class A Series 2013-2, Class A Notes [Member] Series 2013-2, Class A Notes [Member] Total Master Trust 2013 notes Effective Interest Rates Debt Instrument, Interest Rate, Effective Percentage Stated Rates Remaining Term Debt Instrument, Term Long-term 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 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 Equity [Abstract] Dividend per share (in USD per share) Common Stock, Dividends, Per Share, Declared Dividends Dividends Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [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] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Accounts payable, accrued expenses and other liabilities Accounts Payable Accruals And Other Liabilities [Member] Accounts Payable, Accruals and Other Liabilities [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Swap Interest Rate Swap [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Notional Amount Derivative, Notional Amount Fixed Interest Rate Derivative, Swaption Interest Rate Fair Value of Liability Derivative Liability, Fair Value, Gross Liability 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] Schedule of Restricted Cash and Escrow Deposits Schedule of Restricted Cash and Cash Equivalents [Table Text Block] Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] 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 Stockholders' Equity Attributable to Parent Net income Net Income (Loss) Attributable to Parent 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, net (in shares) Issuance of common shares, net Stock Issued During Period, Value, New Issues 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 Estimated forfeitures for dividends declared on employee restricted stock awards Restricted Stock Award, Forfeitures, Dividends Reduction of debt through sale of certain real estate properties Notes Reduction Accrued interest capitalized to principal Interest Costs Capitalized Accrued performance share dividend rights Dividends Payable, Performance Shares Dividends Payable, Performance Shares Accrued deferred financing costs Accrued Deferred Offering Costs Accrued Deferred Offering Costs Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Fair Value 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] Interest rate swaps financial liabilities Derivative Liability Impairment of Real Estate Investments Impairment of Real Estate Investments Impairment of Real Estate Investments Real estate and intangible asset impairment Impairment of Real Estate Write-off of lease intangibles due to lease terminations, net Impairment of Leasehold Other impairment Other Asset Impairment Charges Total impairment loss in continuing and discontinued operations Asset Impairment Charges Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [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] Line of Credit Facility [Table] Line of Credit Facility [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Swingline Loans Bridge Loan [Member] Letters of Credit Letter of Credit [Member] Unsecured Debt Unsecured Debt [Member] Line of Credit Line of Credit [Member] Revolving Credit Facility Revolving Credit Facility [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Weighted Average Weighted Average [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 Maximum borrowing capacity increase, accordion feature Line of Credit Facility, Maximum Borrowing Capacity, Increase Line of Credit Facility, Maximum Borrowing Capacity, Increase 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 Amount outstanding Long-term Line of Credit Line of credit facility remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Debt extinguishment costs Weighted Average Term Number of separate advances Line of Credit Facility, Number of Separate Advances Line of Credit Facility, Number of Separate Advances Weighted Average Effective Interest Rates 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 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 note - principal Loans and Leases Receivable, Gross, Other Total loans receivable, net Loans and Leases Receivable, Net Amount Interest expense associated with non-utilization fees Debt Instrument, Unused Borrowing Capacity, Fee Compensation and Retirement Disclosure [Abstract] Incentive Award Plan and Stock Option Plan Compensation and Employee Benefit Plans [Text Block] Summary of Dividends Declared Dividends Declared [Table Text Block] 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] 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 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 Loss Recognized in Operations on Derivative (Ineffective Portion) Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net Convertible Notes Convertible Debt [Member] 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 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 Income from discontinued operations Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Loss on dispositions of assets Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Income from discontinued operations Number of properties disposed of during period Number Of Properties Disposed Number Of Properties Disposed 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] Number of Properties Owned or Financed Number of Real Estate Properties Owned [Roll Forward] Number of Real Estate Properties Owned [Roll Forward] Gross balance, December 31, 2014 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 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, March 31, 2015 Dollar Amount of Investments Real Estate and Loan Activity [Roll Forward] Real Estate and Loan Activity [Roll Forward] Gross balance, December 31, 2014 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 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, March 31, 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, March 31, 2015 Real Estate Investments, Net Summary of Results of Discontinued Operations Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block] 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 Performance Shares [Member] 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 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 Intangible lease assets, net Intangible Lease Assets Intangible Lease Assets 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 Cash and Cash Equivalents, at Carrying Value Deferred costs and other assets, net Deferred Costs and Other Assets Goodwill Goodwill Total assets Assets Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Liabilities: Liabilities [Abstract] Revolving Credit Facilities, net 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 Liabilities Commitments and contingencies (see Note 7) Commitments and Contingencies Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.01 par value; 418,935,311 issued shares and 418,401,109 outstanding shares at March 31, 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 Total liabilities and stockholders’ equity Liabilities and Equity 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] Loan Status [Axis] Loan Status [Axis] Loan Status [Axis] Loan Status [Domain] Loan Status [Domain] Loan Status [Domain] Notes Notes [Member] Notes [Member] Net assets Net liabilities Amount of reclassification of unamortized deferred financing costs now included as reduction of debt Prior Period Reclassification Adjustment Net unamortized deferred financing costs included as a reduction of debt Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Number of segments Number of Operating Segments Allowance for doubtful accounts 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 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) 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] ATM Program Continuous Equity Offering [Member] Continuous Equity Offering [Member] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Proceeds from issuance of common stock Net proceeds from common stock offering Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule Of Interest Expenses [Table] Schedule Of Interest Expenses [Table] Schedule Of Interest Expenses [Table] Revolving Credit Facilities 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 net losses related to interest rate swaps Amortization Of Net Losses Related To Interest Rate Swap Amortization Of Net Losses Related To Interest Rate Swap Amortization of debt (premium)/discount Amortization of Debt Discount (Premium) Total interest expense Interest Expense 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 Adjustments to reconcile net income 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) Stock-based compensation expense Share-based Compensation 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/investments of 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 net sales proceeds (to) from restricted accounts under 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 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) escrow deposits with lenders Transfers To (From) Escrow Deposits With Lenders Transfers To (From) Escrow Deposits With Lenders Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Debt Debt Disclosure [Text Block] 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] Statement of Comprehensive Income [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in net unrealized 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 Comprehensive Income (Loss), Net of Tax, Attributable to Parent 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] 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 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 Number of shares sold (in shares) Number of properties acquired Number of Real Estate Properties Acquired Number of Real Estate Properties Acquired Revenues Number of properties sold Number of Properties Disposed of, Including Continuing and Discontinued Operations Number of Properties Disposed of, Including Continuing and Discontinued Operations Gross sales proceeds from sale of real estate Proceeds from Sale of Real Estate 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] 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 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 Impairment Expense Impairment Expense Total expenses Costs and Expenses Income from continuing operations before other expense and income tax expense Operating Income (Loss) Other expense: Other Income and Expenses [Abstract] Loss on debt extinguishment Total other expense Nonoperating Income (Expense) 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) Income from continuing operations Discontinued operations: Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent [Abstract] Income from discontinued operations Loss on dispositions of assets Income before gain on dispositions of assets Net Income (Loss) before Gain (Loss) on Dispositions of Assets Net Income (Loss) before Gain (Loss) on Dispositions of Assets Net income attributable to common stockholders Net income 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 per share attributable to common stockholders—basic (in USD per share) Earnings Per Share, Basic Net income 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 per share attributable to common stockholders—diluted (in USD per share) Earnings Per Share, Diluted Weighted average common shares outstanding: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Basic (in shares) Diluted (in shares) Dividends declared per common share issued (in USD per share) Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Document and Entity Information [Abstract] 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 Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Convertible Senior Notes Convertible Notes Payable [Member] 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] Aggregate principal amount of debt Debt Instrument, Face Amount 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 Value of the embedded conversion premium, included in net debt (discount) Debt Instrument, Unamortized Discount Deferred financing costs Unamortized deferred financing costs Unamortized Debt Issuance Expense Income Per Share Earnings Per Share [Text Block] 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 Revolving Credit Facilities Revolving Credit Facilities [Member] Revolving Credit Facilities - Credit Facility and Line of Credit [Member] Convertible Notes Unsecured fixed rate promissory note Investment [Table] Investment [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] Texas Texas [Member] Texas [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 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 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. Number of interest rate derivatives held Number of Interest Rate Derivatives Held Notional amount Schedule of Capital Leased Assets [Table] Schedule of Capital Leased Assets [Table] 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 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 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, 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