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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance Retention, All Other Peril, Coverage $ 110,000    
Ceded Losses and LAE Incurred 645,204 $ 549,188 $ 790,183
Ceded Losses and LAE Incurred - Named Storm Ceding $ 142,145