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Debt Obligations, net (Schedule of Debt) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt obligations |  |  |  | $ 3,314,550 |  |  | $ 3,314,550 |  |  |  |  |  |  |  |
Debt discounts and deferred financing costs, net |  |  |  | (25,069) |  |  | (25,069) |  |  |  |  | $ (38,475) |  |  |
Total debt obligations, net | [1] |  |  | 3,289,481 |  |  | 3,289,481 |  |  |  |  | 3,286,975 |  |  |
Stockholders' equity |  |  |  | 1,008,706 | [1] | $ 1,113,785 | 1,008,706 | [1] | $ 1,113,785 | $ 1,051,007 |  | 1,064,383 | [1] | $ 1,160,069 | $ 1,237,960
Interest costs capitalized |  |  |  | $ 200 |  | $ 600 | $ 500 |  | $ 1,100 |  |  |  |  |  |
Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  | (10,019) |  |  | $ (12,382)
Period of Adoption, Adjustment | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discounts and deferred financing costs, net |  |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |
Total debt obligations, net |  |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |
Senior Term Loan | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
3.125% Senior Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rates |  |  |  | 3.125% |  | 3.125% | 3.125% |  | 3.125% |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt obligations |  |  |  | $ 1,202,050 |  |  | $ 1,202,050 |  |  |  |  | 1,212,950 |  |  |
Debt discounts and deferred financing costs, net |  |  |  | (5,287) |  |  | (5,287) |  |  |  |  |  |  |  |
Total debt obligations, net |  |  |  | 1,196,763 |  |  | 1,196,763 |  |  |  |  |  |  |  |
Assets served as collateral |  |  |  | 2,000,000 |  |  | 2,000,000 |  |  |  |  |  |  |  |
Secured Debt | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt obligations |  |  |  | 0 |  |  | $ 0 |  |  |  |  | 0 |  |  |
Debt instrument term |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  | 2.00% |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | LIBOR | Minimum | Interest Rate Category Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | LIBOR | Maximum | Interest Rate Category Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | Base Rate | Minimum | Interest Rate Category One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | Base Rate | Maximum | Interest Rate Category One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |
Secured Debt | Senior Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt obligations |  |  |  | 491,875 |  |  | $ 491,875 |  |  |  |  | 491,875 |  |  |
Secured Debt | Senior Term Loan | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  | 2.75% |  |  |  | 2.75% |  |  |  |  |  |  |  |
Secured Debt | Senior Term Loan | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |
Secured Debt | Senior Term Loan | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |
Secured Debt | Mortgages Collateralized by Net Lease Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt obligations |  |  |  | $ 710,175 |  |  | $ 710,175 |  |  |  |  | 721,075 |  |  |
Weighted average interest rate |  |  |  | 4.40% |  |  | 4.40% |  |  |  |  |  |  |  |
Secured Debt | Mortgages Collateralized by Net Lease Assets | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  |  |  | 1.65% |  |  |  |  |  |  |  |
Secured Debt | Mortgages Collateralized by Net Lease Assets | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  |  |  | 7.26% |  |  |  |  |  |  |  |
Unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt obligations |  |  |  | $ 2,012,500 |  |  | $ 2,012,500 |  |  |  |  | 2,012,500 |  |  |
Unsecured notes | 3.125% Senior Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt obligations |  |  |  | $ 287,500 |  |  | $ 287,500 |  |  |  |  | 287,500 |  |  |
Total debt obligations, net |  |  |  |  |  |  |  |  |  |  |  | $ 275,100 |  |  |
Stated interest rates |  |  |  | 3.125% |  | 3.125% | 3.125% |  | 3.125% |  | 3.125% | 3.125% |  | 3.125% |
Convertible debt, conversion ratio (in shares per par value) |  |  |  |  |  |  | 0.0712325 |  |  |  |  |  |  |  |
Convertible debt, conversion price (in dollars per share) |  |  |  | $ 14.04 |  |  | $ 14.04 |  |  |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  |  |  |  |  |  | $ 10,200 |  |  |
Contractual interest |  |  |  | $ 2,200 |  | $ 2,200 | $ 4,500 |  | $ 4,500 |  |  |  |  |  |
Amortization of debt discount |  |  |  |  |  | $ 1,300 |  |  | $ 2,600 |  |  |  |  |  |
Effective interest rate |  |  |  |  |  | 5.20% |  |  | 5.20% |  |  |  |  |  |
Unsecured notes | 3.125% Senior Convertible Notes | Period of Adoption, Adjustment | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rates |  |  |  |  |  |  |  |  |  |  | 3.125% |  |  |  |
Unsecured notes | 4.75% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt obligations |  |  |  | $ 775,000 |  |  | $ 775,000 |  |  |  |  | 775,000 |  |  |
Stated interest rates |  |  |  | 4.75% |  |  | 4.75% |  |  |  |  |  |  |  |
Unsecured notes | 4.25% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt obligations |  |  |  | $ 550,000 |  |  | $ 550,000 |  |  |  |  | 550,000 |  |  |
Stated interest rates |  |  |  | 4.25% |  |  | 4.25% |  |  |  |  |  |  |  |
Unsecured notes | 5.50% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt obligations |  |  |  | $ 400,000 |  |  | $ 400,000 |  |  |  |  | 400,000 |  |  |
Stated interest rates |  |  |  | 5.50% |  |  | 5.50% |  |  |  |  |  |  |  |
Other Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt obligations |  |  |  | $ 3,314,550 |  |  | $ 3,314,550 |  |  |  |  | 3,325,450 |  |  |
Other Debt Obligations | Trust Preferred Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt obligations |  |  |  | $ 100,000 |  |  | $ 100,000 |  |  |  |  | $ 100,000 |  |  |
Basis point spread on variable interest rate |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |
[1] | Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).

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