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Allowance for Expected Credit Losses - Reinsurance recoverables (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Credit Loss [Abstract]  
Balance at beginning of period $ 4,346,816
Balance at end of period 4,500,802
Allowance for Expected Credit Losses  
Balance at beginning of period 1,364
Cumulative effect of accounting change 12,010 [1]
Change for provision of expected credit losses (1,738)
Balance at end of period $ 11,636
[1] Adoption of ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326)”