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Schedule VI. Supplementary Insurance Information Concerning Property-Casualty Insurance Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]      
Current year $ 3,108,421 $ 2,123,876 $ 1,390,767
Prior years (183,812) (26,855) (270,749)
Consolidated Subsidiaries      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]      
Deferred Policy Acquisition Costs 633,521 663,991 476,661
Reserves for Unpaid Claims and Claim Adjustment Expenses 10,381,138 9,384,349 6,076,271
Discount, if any, Deducted 0 0 0
Unearned Premiums 2,763,599 2,530,975 1,716,021
Earned Premiums 3,952,462 3,338,403 1,976,129
Net Investment Income 354,038 424,207 269,965
Current year 3,108,421 2,123,876 1,390,767
Prior years   (26,855) (270,749)
Amortization of Deferred Policy Acquisition Costs 897,677 762,232 432,989
Paid Claims and Claim Adjustment Expenses 2,004,628 1,098,054 894,769
Net Premiums Written $ 4,096,333 $ 3,381,493 $ 2,131,902