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Debt Obligations, net (Schedule of Debt) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total debt obligations		$ 2,604,375	$ 2,604,375
Debt discounts and deferred financing costs, net		(32,201)	(35,095)
Total debt obligations, net		2,572,174	2,569,280
Stockholders' equity		1,063,206	1,064,383	$ 1,237,960	$ 1,064,115
Interest costs capitalized		$ 1,000	1,400	7,400
Period of Adoption, Adjustment
Debt Instrument [Line Items]
Stockholders' equity			(10,019)	(12,382)
Period of Adoption, Adjustment | ASU 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 rate		3.125%
Secured Debt
Debt Instrument [Line Items]
Total debt obligations		$ 491,875	491,875
Debt discounts and deferred financing costs, net		(1,597)
Total debt obligations, net		490,278
Assets served as collateral		$ 900,000
Secured Debt | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis point spread on variable interest rate		2.00%
Debt instrument term		1 year
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
Secured Debt | Senior Term Loan | LIBOR
Debt Instrument [Line Items]
Basis point spread on variable interest rate		2.75%
Secured Debt | Senior Term Loan | LIBOR | Interest Rate Category One
Debt Instrument [Line Items]
Basis point spread on variable interest rate		1.75%
Secured Debt | Senior Term Loan | LIBOR | Interest Rate Category Two
Debt Instrument [Line Items]
Basis point spread on variable interest rate		2.75%
Secured Debt | Senior Term Loan | Federal Funds Rate
Debt Instrument [Line Items]
Basis point spread on variable interest rate		0.50%
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 rate		3.125%	3.125%
Convertible debt, conversion ratio (in shares per par value)		0.0719478
Convertible debt, conversion price (in dollars per share)		$ 13.90
Unamortized discount		$ 10,200
Contractual interest		9,000	$ 9,000	9,000
Amortization of debt discount			$ 5,200	$ 5,000
Effective interest rate			5.20%	5.20%
Unsecured notes | 4.75% Senior Notes
Debt Instrument [Line Items]
Total debt obligations		$ 775,000	$ 775,000
Stated interest rate		4.75%
Unsecured notes | 4.25% Senior Notes
Debt Instrument [Line Items]
Total debt obligations		$ 550,000	550,000
Stated interest rate		4.25%
Unsecured notes | 5.50% Senior Notes
Debt Instrument [Line Items]
Total debt obligations		$ 400,000	400,000
Stated interest rate		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%

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