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Debt Obligations - Senior Unsecured Notes (Details) - USD ($) $ in Thousands	1 Months Ended										12 Months Ended
	Dec. 31, 2021	Aug. 31, 2021	Apr. 30, 2021	Jun. 30, 2020	Apr. 30, 2020	Mar. 31, 2020	Oct. 31, 2019	Mar. 31, 2019	May 31, 2018	Mar. 31, 2018	Dec. 31, 2021	Dec. 31, 2020
Debt Obligations
Senior notes carrying value	$ 1,280,545										$ 1,280,545	$ 662,843
5.00% Convertible notes
Debt Obligations
Junior subordinated notes	$ 180,000										$ 180,000
Interest rate (as a percent)	5.00%										5.00%
Proceeds from issued debt	$ 177,200
4.50% Convertible Notes
Debt Obligations
Junior subordinated notes	$ 275,000	$ 270,000				$ 275,000					$ 275,000	275,000
Interest rate (as a percent)	4.50%	4.50%				4.50%					4.50%
Proceeds from issued debt		$ 265,800				$ 271,800
5.00% Convertible Notes
Debt Obligations
Junior subordinated notes	$ 175,000		$ 175,000								$ 175,000
Interest rate (as a percent)	5.00%		5.00%								5.00%
Proceeds from issued debt			$ 172,300
5.625% Notes
Debt Obligations
Junior subordinated notes	$ 125,000									$ 100,000	$ 125,000	125,000
Interest rate (as a percent)	5.625%									5.625%	5.625%
Proceeds from issued debt									$ 25,000	$ 122,300
4.75% Notes
Debt Obligations
Junior subordinated notes	$ 110,000										$ 110,000	110,000
Redemption of aggregate principal amount (as a percent)							100.00%				100.00%
5.75% Convertible Notes
Debt Obligations
Junior subordinated notes	$ 90,000							$ 90,000			$ 90,000	90,000
Interest rate (as a percent)	5.75%							5.75%			5.75%
Proceeds from issued debt								$ 88,200
Senior Unsecured Notes
Debt Obligations
Junior subordinated notes	$ 1,295,750										$ 1,295,750	670,750
8.00% Convertible Notes
Debt Obligations
Junior subordinated notes	$ 70,750				$ 40,500						$ 70,750	70,750
Interest rate (as a percent)	8.00%				8.00%						8.00%
Proceeds from issued debt				$ 30,300	$ 69,600
Collateralized debt obligations
Debt Obligations
Junior subordinated notes	$ 5,924,705										$ 5,924,705	$ 2,532,343

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Face (par) amount of debt instrument at time of issuance.

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