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Debt Obligations - Senior Unsecured Notes (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Oct. 31, 2022	Aug. 31, 2021	Oct. 31, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Obligations
Redemption of aggregate principal amount (as a percent)				100.00%
Senior notes carrying value				$ 1,385,994	$ 1,280,545
5.00% Convertible notes
Debt Obligations
Debt, Face Value (UPB)	$ 150,000			$ 180,000	$ 180,000
Interest rate (as a percent)	8.50%			5.00%	5.00%
Proceeds from issued debt	$ 147,500				$ 177,200
4.50% Convertible Notes
Debt Obligations
Debt, Face Value (UPB)		$ 270,000		$ 270,000	270,000	$ 275,000
Interest rate (as a percent)		4.50%		4.50%		4.50%
Proceeds from issued debt		$ 265,800				$ 271,800
5.00% Convertible Notes
Debt Obligations
Debt, Face Value (UPB)				$ 175,000	$ 175,000
Interest rate (as a percent)				5.00%	5.00%
Proceeds from issued debt					$ 172,300
5.625% Notes
Debt Obligations
Debt, Face Value (UPB)				$ 78,850	125,000			$ 125,000
Interest rate (as a percent)	5.625%			5.625%				5.625%
Proceeds from issued debt								$ 122,300
4.75% Notes
Debt Obligations
Debt, Face Value (UPB)				$ 110,000	110,000
Interest rate (as a percent)				4.75%
Redemption of aggregate principal amount (as a percent)			100.00%	100.00%
5.75% Convertible Notes
Debt Obligations
Debt, Face Value (UPB)				$ 90,000	90,000		$ 90,000
Interest rate (as a percent)				5.75%			5.75%
Proceeds from issued debt							$ 88,200
Senior Notes [Member]
Debt Obligations
Debt, Face Value (UPB)				$ 1,399,600	1,295,750
8.00% Convertible Notes
Debt Obligations
Debt, Face Value (UPB)				$ 70,750	$ 70,750	$ 70,800
Interest rate (as a percent)				8.00%		8.00%
Proceeds from issued debt						$ 69,600

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