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Fair Value Measurements - Change in Fair Value of Level 3 Financial Assets and Liabilities that are Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Fair Value Disclosures [Abstract]        
Beginning balance $ 393,501 $ 206,729 $ 195,767 $ 166,428
Net gain included in "Investment and derivative gain (loss), net" (13,199) 4,504 (11,583) 9,639
Additions from consolidation of VIEs 0 0 276,594 0
Transfers to real estate owned by consolidated VIE (78) 0 (277) 0
Purchases 40,474 35,601 61,693 128,614
Sales 0 0 (12,406) (1,662)
Payments, net (14,671) (68,810) (110,052) (128,350)
Accretion (amortization) of discount (premium), net 4,090 2,411 10,381 5,766
Ending balance 410,117 180,435 410,117 180,435
Net unrealized gains (losses) included in earnings for the period for Level 3 assets still held at the reporting date (13,199) 4,504 (10,552) 9,719
Beginning balance 11,521 640 508 576
Net gain included in "Investment and derivative gain (loss), net" (808) 9 (2,140) (1)
Additions from consolidation of VIEs 0 0 14,278 0
Payments, net (374) 3 (2,170) 3
(Amortization) accretion of (premium) discount, net (15) 0 (152) 74
Ending balance 10,324 652 10,324 652
Net unrealized losses (gains) included in earnings for the period for Level 3 liabilities still held at the reporting date $ (808) $ 9 $ (2,140) $ (1)