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Reserves for Losses and Loss Settlement Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross liability for losses and loss settlement expenses at beginning of year $ 1,578,131 $ 1,421,754
Ceded losses and loss settlement expenses (131,843) (68,536)
Net liability for losses and loss settlement expenses at beginning of year 1,446,288 1,353,218
Losses and loss settlement expenses incurred for claims occurring during    
Current year 217,621 887,119
Prior years (13,259) (17,652)
Total incurred 206,398 869,467
Losses and loss settlement expense payments for claims occurring during    
Current year 54,053 354,635
Prior years 123,533 421,762
Total paid 177,586 776,397
Net liability for losses and loss settlement expenses at end of year 1,475,100 1,446,288
Ceded loss and loss settlement expenses 137,925 131,843
Gross liability for losses and loss settlement expenses at end of period $ 1,613,025 $ 1,578,131