Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of non-recourse securitization obligations	$ 2,030,000	$ 1,870,000
Difference between amortized cost and fair value of non-recourse securitization obligations	(88,000)	(79,000)
Amortized cost of non-recourse securitization obligations	2,120,000	1,950,000
Investments in Majority-Owned Affiliates	25,667	25,474
Amortized cost
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in Majority-Owned Affiliates	25,700	25,500
Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in Majority-Owned Affiliates	20,600	20,500
Residential mortgage loans in securitization trusts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Difference between amortized cost and fair value of non-recourse securitization obligations	$ 49,000
AOMT 2021-4 and 2021-7
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Difference between amortized cost and fair value of non-recourse securitization obligations		$ 48,800