Other Debt - Summary of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Interest expense — portfolio related	$ 51,405	$ 47,583	$ 45,451	$ 42,029	$ 40,854	$ 34,561	$ 28,752	$ 23,556	$ 186,468	$ 127,723	$ 85,386
Interest expense — corporate debt	$ 4,140	$ 4,138	$ 4,139	$ 4,139	$ 4,139	$ 4,011	$ 4,182	$ 17,140	16,556	29,472	20,609
Total interest expense									203,024	157,195	105,995
Warehouse and Repurchase Facilities
Debt Instrument [Line Items]
Interest expense — portfolio related									21,726	17,454	9,706
Securitized Debt
Debt Instrument [Line Items]
Interest expense — portfolio related									$ 164,742	$ 110,269	$ 75,680