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Debt Obligations, net (Schedule of Debt) (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended
		Sep. 30, 2019	Jun. 30, 2018	Mar. 31, 2021 USD ($) $ / shares		Mar. 31, 2020 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)		Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Total debt obligations				$ 3,318,141				$ 3,325,450
Debt discounts and deferred financing costs, net				(26,798)				(38,475)
Total debt obligations, net	[1]			3,291,343				3,286,975
Stockholders' equity				1,051,007	[1]	$ 1,160,069		1,064,383	[1]	$ 1,237,960
Interest costs capitalized				$ 300		$ 500
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
Stockholders' equity							$ 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%
Secured Credit Facility and Mortgages
Debt Instrument [Line Items]
Total debt obligations				$ 1,205,641				1,212,950
Debt discounts and deferred financing costs, net				(5,676)
Total debt obligations, net				1,199,965
Assets served as collateral				2,100,000
Secured Credit Facility and Mortgages | Revolving Credit Facility
Debt Instrument [Line Items]
Total debt obligations				$ 0				0
Debt instrument term		1 year
Secured Credit Facility and Mortgages | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis point spread on variable interest rate				2.00%
Secured Credit Facility and Mortgages | Revolving Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis point spread on variable interest rate		2.00%		1.00%
Secured Credit Facility and Mortgages | Revolving Credit Facility | LIBOR | Minimum | Interest Rate Category Two
Debt Instrument [Line Items]
Basis point spread on variable interest rate				2.00%
Secured Credit Facility and Mortgages | Revolving Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis point spread on variable interest rate		2.50%
Secured Credit Facility and Mortgages | Revolving Credit Facility | LIBOR | Maximum | Interest Rate Category Two
Debt Instrument [Line Items]
Basis point spread on variable interest rate				2.50%
Secured Credit Facility and Mortgages | Revolving Credit Facility | Federal Funds Rate
Debt Instrument [Line Items]
Basis point spread on variable interest rate				0.50%
Secured Credit Facility and Mortgages | Revolving Credit Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis point spread on variable interest rate		1.00%
Secured Credit Facility and Mortgages | Revolving Credit Facility | Base Rate | Minimum | Interest Rate Category One
Debt Instrument [Line Items]
Basis point spread on variable interest rate				1.00%
Secured Credit Facility and Mortgages | Revolving Credit Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis point spread on variable interest rate		1.50%
Secured Credit Facility and Mortgages | Revolving Credit Facility | Base Rate | Maximum | Interest Rate Category One
Debt Instrument [Line Items]
Basis point spread on variable interest rate				1.50%
Secured Credit Facility and Mortgages | Senior Term Loan
Debt Instrument [Line Items]
Total debt obligations				$ 491,875				491,875
Secured Credit Facility and Mortgages | Senior Term Loan | LIBOR
Debt Instrument [Line Items]
Basis point spread on variable interest rate			2.75%	2.75%
Secured Credit Facility and Mortgages | Senior Term Loan | LIBOR | Maximum
Debt Instrument [Line Items]
Basis point spread on variable interest rate				1.75%
Secured Credit Facility and Mortgages | Senior Term Loan | Federal Funds Rate
Debt Instrument [Line Items]
Basis point spread on variable interest rate				0.50%
Secured Credit Facility and Mortgages | Mortgages Collateralized by Net Lease Assets
Debt Instrument [Line Items]
Total debt obligations				$ 713,766				721,075
Weighted average interest rate				4.40%
Secured Credit Facility and Mortgages | Mortgages Collateralized by Net Lease Assets | Minimum
Debt Instrument [Line Items]
Stated interest rates				1.66%
Secured Credit Facility and Mortgages | Mortgages Collateralized by Net Lease Assets | Maximum
Debt Instrument [Line Items]
Stated interest rates				7.26%
Unsecured Notes
Debt Instrument [Line Items]
Total debt obligations				$ 2,012,500				2,012,500
Unsecured Notes | 3.125% Senior Convertible Notes
Debt Instrument [Line Items]
Total debt obligations				$ 287,500				287,500
Total debt obligations, net								$ 275,100
Stated interest rates				3.125%		3.125%	3.125%	3.125%
Convertible debt, conversion ratio (in shares per par value)				0.070716
Convertible debt, conversion price (in dollars per share) | $ / shares				$ 14.14
Unamortized discount								$ 10,200
Contractual interest				$ 2,200		$ 2,200
Amortization of debt discount						$ 1,300
Effective interest rate						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
Stated interest rates				4.75%
Unsecured Notes | 4.25% Senior Notes
Debt Instrument [Line Items]
Total debt obligations				$ 550,000				550,000
Stated interest rates				4.25%
Unsecured Notes | 5.50% Senior Notes
Debt Instrument [Line Items]
Total debt obligations				$ 400,000				400,000
Stated interest rates				5.50%
Other Debt Obligations | Trust Preferred Securities
Debt Instrument [Line Items]
Total debt obligations				$ 100,000				$ 100,000
Other Debt Obligations | Trust Preferred Securities | LIBOR
Debt Instrument [Line Items]
Basis point spread on variable interest rate				1.50%
[1] (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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