Fair Value Measurements - Unobservable Inputs Reconciliation - Assets (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 61,628	$ 63,497
Sales and cash collections	(3,008)	(1,731)
Realized gains	1,260	1,734
Unrealized gains	43
Unrealized losses	(2)	(764)
Balance at end of period	59,921	62,736
Long Term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	52,336	50,085
Sales and cash collections	(1,000)	0
Realized gains	0	0
Unrealized gains	43
Unrealized losses	(2)	(764)
Balance at end of period	51,377	49,321
Economic Interest In Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	5,728	6,483
Sales and cash collections	(2,008)	(1,731)
Realized gains	1,260	1,030
Unrealized gains	0
Unrealized losses	0	0
Balance at end of period	4,980	5,782
Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	3,564	6,929
Sales and cash collections	0	0
Realized gains	0	704
Unrealized gains	0
Unrealized losses	0	0
Balance at end of period	$ 3,564	$ 7,633