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Allowance for Expected Credit Losses - Reinsurance recoverables (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Credit Loss [Abstract]    
Balance at beginning of period $ 5,880,735 $ 4,500,802
Balance at end of period 5,941,000 4,041,076
Allowance for Expected Credit Losses    
Balance at beginning of period 13,230 11,636
Change for provision of expected credit losses 5,253 (764)
Balance at end of period $ 18,483 $ 10,872