Long-Term Debt - Schedule of Components of Long-Term Debt (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Borrowings	$ 1,743,934,000	$ 1,746,145,000
Unamortized Deferred Issuance Costs / Discount	(10,906,000)	(12,720,000)
Net Carrying Value	1,733,028,000	1,733,425,000
Line of Credit
Debt Instrument [Line Items]
Borrowings	1,077,142,000	1,079,353,000
Unamortized Deferred Issuance Costs / Discount	(1,043,000)	(2,153,000)
Net Carrying Value	1,076,099,000	1,077,200,000
Trust Preferred Securities and Subordinated Notes
Debt Instrument [Line Items]
Borrowings	139,500,000	139,500,000
Unamortized Deferred Issuance Costs / Discount	(721,000)	(733,000)
Net Carrying Value	$ 138,779,000	$ 138,767,000
Trust Preferred Securities and Subordinated Notes | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.25%	2.25%
Facility A | Recourse Subordinate Securities Financing | Affiliated Entity
Debt Instrument [Line Items]
Borrowings	$ 129,329,000	$ 130,408,000
Unamortized Deferred Issuance Costs / Discount	0	0
Net Carrying Value	$ 129,329,000	$ 130,408,000
Weighted Average Interest Rate (as a percent)	5.71%	5.71%
Facility B | Recourse Subordinate Securities Financing | Affiliated Entity
Debt Instrument [Line Items]
Borrowings	$ 101,691,000	$ 101,706,000
Unamortized Deferred Issuance Costs / Discount	0	(50,000)
Net Carrying Value	$ 101,691,000	$ 101,656,000
Weighted Average Interest Rate (as a percent)	5.71%	4.21%
Facility C | Recourse Subordinate Securities Financing | Affiliated Entity
Debt Instrument [Line Items]
Borrowings	$ 66,197,000	$ 68,995,000
Unamortized Deferred Issuance Costs / Discount	(63,000)	(125,000)
Net Carrying Value	$ 66,134,000	$ 68,870,000
Weighted Average Interest Rate (as a percent)	4.75%	4.75%
Facility D | Line of Credit
Debt Instrument [Line Items]
Borrowings	$ 427,310,000	$ 404,622,000
Unamortized Deferred Issuance Costs / Discount	(68,000)	(667,000)
Net Carrying Value	427,242,000	403,955,000
Limit	$ 750,000,000	$ 750,000,000
Facility D | Line of Credit | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.87%	2.87%
Facility E | Line of Credit
Debt Instrument [Line Items]
Borrowings	$ 305,159,000	$ 308,933,000
Unamortized Deferred Issuance Costs / Discount	(912,000)	(838,000)
Net Carrying Value	304,247,000	308,095,000
Limit	$ 335,000,000	$ 335,000,000
Facility E | Line of Credit | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	3.25%	3.25%
Facility F | Line of Credit
Debt Instrument [Line Items]
Borrowings	$ 0	$ 64,689,000
Unamortized Deferred Issuance Costs / Discount	0	(473,000)
Net Carrying Value	0	64,216,000
Limit	$ 500,000,000	$ 500,000,000
Facility F | Line of Credit | SOFR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.50%	2.25%
Facility F | Line of Credit | SOFR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.25%	2.50%
Facility G | Line of Credit
Debt Instrument [Line Items]
Borrowings	$ 47,456,000
Unamortized Deferred Issuance Costs / Discount	0
Net Carrying Value	47,456,000
Limit	$ 50,000,000
Facility G | Line of Credit | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	3.25%
5.625% convertible senior notes | Convertible notes
Debt Instrument [Line Items]
Borrowings	$ 150,200,000	$ 150,200,000
Unamortized Deferred Issuance Costs / Discount	(1,076,000)	(1,282,000)
Net Carrying Value	$ 149,124,000	$ 148,918,000
Weighted Average Interest Rate (as a percent)	5.625%	5.625%
5.75% exchangeable senior notes | Convertible notes
Debt Instrument [Line Items]
Borrowings	$ 162,092,000	$ 162,092,000
Unamortized Deferred Issuance Costs / Discount	(2,207,000)	(2,410,000)
Net Carrying Value	$ 159,885,000	$ 159,682,000
Weighted Average Interest Rate (as a percent)	5.75%	5.75%
7.75% convertible senior notes | Convertible notes
Debt Instrument [Line Items]
Borrowings	$ 215,000,000	$ 215,000,000
Unamortized Deferred Issuance Costs / Discount	(5,859,000)	(6,142,000)
Net Carrying Value	$ 209,141,000	$ 208,858,000
Weighted Average Interest Rate (as a percent)	7.75%	7.75%