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Commitments and Contingencies - Reinsurance Agreements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]      
Reinsurance premiums assumed $ 23,179 $ 19,130 $ 83,325
Reinsurance premiums ceded (1,614) (3,275) 0
Claims assumed 20,468 14,812 72,594
Claims ceded 0 (422) 0
Claims-related administrative expenses 2,159 0 14,024
Increase (decrease) in reserves for claims and performance-based arrangements attributable to the Reinsurance Agreement 2,166 1,465 (3,293)
Reserves for claims and performance-based arrangements attributable to the Reinsurance Agreement at the beginning of the period 4,002 0 1,243
Impact of consolidation on payable for claims and performance-based arrangements attributable to the Reinsurance Agreement 0 (502) 0
Reinsurance payments paid (received) 6,078   4,536
Reinsurance payments paid (received)   (3,039)  
Payable for claims and performance-based arrangements attributable to the Reinsurance Agreement at the end of the period $ 90 $ 4,002 $ 0