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Reinsurance Recoverables (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reinsurance Disclosures [Abstract]      
Reinsurance Recoverables on Unpaid Losses $ 674,746 $ 482,315 $ 477,870
Reinsurance Recoverables on Paid Losses 146,410 67,821  
Reinsurance recoverable on paid and unpaid losses $ 821,156 $ 550,136