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Historical Loss and LAE Development - Schedule of Reconciliation of Unpaid Losses and Settlement Expenses (LAE) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Unpaid losses and LAE at beginning of year    
Gross $ 1,750,049 $ 1,574,352
Ceded (443,729) (384,517)
Net 1,306,320 1,189,835
Increase (decrease) in incurred losses and LAE    
Current accident year 279,380 253,031
Prior accident years (67,462) (40,808)
Total incurred 211,918 212,223
Loss and LAE payments for claims incurred    
Current accident year (28,991) (25,588)
Prior accident years (116,723) (148,885)
Total paid (145,714) (174,473)
Net unpaid losses and LAE at June 30 1,372,524 1,226,240
Unpaid losses and LAE at June 30    
Gross 1,917,609 1,590,996
Ceded (545,085) (364,756)
Net unpaid losses and LAE at June 30 $ 1,372,524 1,226,240
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment    
Unpaid losses and LAE at beginning of year    
Ceded   $ (1,345)