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Debt Obligations, net (Schedule of Debt) (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended			9 Months Ended
		Sep. 30, 2019	Jun. 30, 2018	Sep. 30, 2021		Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020	Jun. 30, 2021	Jan. 01, 2021	Dec. 31, 2020		Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt obligations				$ 3,305,916			$ 3,305,916
Debt discounts and deferred financing costs, net				(23,318)			(23,318)					$ (38,475)
Total debt obligations, net	[1]			3,282,598			3,282,598					3,286,975
Stockholders' equity				1,066,225	[1]	$ 1,093,448	1,066,225	[1]	$ 1,093,448	$ 1,008,706		1,064,383	[1]	$ 1,113,785	$ 1,237,960
Interest costs capitalized				$ 200		$ 500	$ 700		$ 1,600
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 rate				3.125%		3.125%	3.125%		3.125%
4.75% Senior Notes
Debt Instrument [Line Items]
Stated interest rate				4.75%			4.75%
4.25% Senior Notes
Debt Instrument [Line Items]
Stated interest rate				4.25%			4.25%
5.50% Senior Notes
Debt Instrument [Line Items]
Stated interest rate				5.50%			5.50%
Secured Debt
Debt Instrument [Line Items]
Total debt obligations				$ 1,193,416			$ 1,193,416					1,212,950
Debt discounts and deferred financing costs, net				(4,892)			(4,892)
Total debt obligations, net				1,188,524			1,188,524
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				$ 701,541			$ 701,541					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							1.63%
Secured Debt | Mortgages Collateralized by Net Lease Assets | Maximum
Debt Instrument [Line Items]
Basis point spread on variable interest rate							7.19%
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 rate				3.125%		3.125%	3.125%		3.125%		3.125%	3.125%
Convertible debt, conversion ratio (in shares per par value)							0.0715797
Convertible debt, conversion price (in dollars per share)				$ 13.97			$ 13.97
Unamortized discount												$ 10,200
Contractual interest				$ 2,200		$ 2,200	$ 6,700		$ 6,700
Amortization of debt discount						$ 1,300			$ 3,900
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 rate											3.125%
Unsecured notes | 4.75% Senior Notes
Debt Instrument [Line Items]
Total debt obligations				$ 775,000			$ 775,000					775,000
Stated interest rate				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 rate				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 rate				5.50%			5.50%
Other Debt Obligations
Debt Instrument [Line Items]
Total debt obligations				$ 3,305,916			$ 3,305,916					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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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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