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Debt Obligations - Senior Unsecured Notes, Summary (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2019	Dec. 31, 2021	Aug. 31, 2021	Apr. 30, 2021	Dec. 31, 2020	Apr. 30, 2020	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Debt Obligations
Wtd. Avg Rate		2.21%			2.20%
Senior Unsecured Notes
Debt Obligations
UPB		$ 1,295,750			$ 670,750
Carrying value		$ 1,280,545			$ 662,843
Wtd. Avg Rate		5.05%			5.29%
Deferred financing fees		$ 15,200			$ 7,900
5.00% Convertible notes
Debt Obligations
UPB		180,000
Carrying value		$ 177,105
Wtd. Avg Rate		5.00%
Interest rate (as a percent)		5.00%
5.00% Convertible Notes
Debt Obligations
UPB		$ 175,000		$ 175,000
Carrying value		$ 172,302
Wtd. Avg Rate		5.00%
Interest rate (as a percent)		5.00%		5.00%
8.00% Convertible Notes
Debt Obligations
UPB		$ 70,750			70,750	$ 40,500
Carrying value		$ 70,202			$ 69,793
Wtd. Avg Rate		8.00%			8.00%
Interest rate (as a percent)		8.00%				8.00%
4.50% Convertible Notes
Debt Obligations
UPB		$ 275,000	$ 270,000		$ 275,000		$ 275,000
Carrying value		$ 272,477			$ 271,994
Wtd. Avg Rate		4.50%			4.50%
Interest rate (as a percent)		4.50%	4.50%				4.50%
4.50% Senior Unsecured Notes
Debt Obligations
UPB		$ 270,000
Carrying value		$ 266,090
Wtd. Avg Rate		4.50%
4.75% Notes
Debt Obligations
UPB		$ 110,000			$ 110,000
Carrying value		$ 109,018			$ 108,668
Wtd. Avg Rate		4.75%			4.75%
Redemption of aggregate principal amount (as a percent)	100.00%	100.00%
5.75% Convertible Notes
Debt Obligations
UPB		$ 90,000			$ 90,000			$ 90,000
Carrying value		$ 89,135			$ 88,751
Wtd. Avg Rate		5.75%			5.75%
Interest rate (as a percent)		5.75%						5.75%
5.625% Notes
Debt Obligations
UPB		$ 125,000			$ 125,000				$ 100,000
Carrying value		$ 124,216			$ 123,637
Wtd. Avg Rate		5.63%			5.63%
Interest rate (as a percent)		5.625%							5.625%
Collateralized debt obligations
Debt Obligations
UPB		$ 5,924,705			$ 2,532,343

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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