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Allowance for Expected Credit Losses - Reinsurance recoverables (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Credit Loss [Abstract]        
Balance at beginning of period $ 4,314,515 $ 4,363,507 $ 4,500,802 $ 4,346,816
Balance at end of period 5,358,852 4,621,937 5,358,852 4,621,937
Allowance for Expected Credit Losses        
Balance at beginning of period 11,029 13,595 11,636 1,364
Cumulative effect of accounting change [1]       12,010
Change for provision of expected credit losses 1,802 399 1,195 620
Balance at end of period $ 12,831 $ 13,994 $ 12,831 $ 13,994
[1] Adoption of ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326)”