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Reinsurance Reinsurance (Allowance for Credit Losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Effects of Reinsurance [Line Items]    
Reinsurance recoverables, gross $ 5,505,162 $ 5,459,561
Allowance for credit losses (32,813) (26,849)
Reinsurance recoverables $ 5,472,349 $ 5,432,712