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Fair Value Measurements - Schedule of Sensitivity in the Fair Value of Senior Asset-Backed Securities to Adverse Changes in Key Assumptions (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 4,046,761	$ 3,706,709
Senior asset-backed securities related to Structured Program transactions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,394,054	3,092,410
100 basis point increase	(37,308)	(32,467)
200 basis point increase	$ (74,616)	$ (64,934)
Senior asset-backed securities related to Structured Program transactions | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Expected remaining weighted-average life (in years)	1 year 1 month 6 days	1 year 1 month 6 days

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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