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Schedule VI. Supplementary Insurance Information Concerning Property-Casualty Insurance Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]      
Current year $ 4,125,557 $ 3,108,421 $ 2,123,876
Prior years (249,470) (183,812) (26,855)
Consolidated Subsidiaries      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]      
Deferred Policy Acquisition Costs 849,160 633,521 663,991
Reserves for Unpaid Claims and Claim Adjustment Expenses 13,294,630 10,381,138 9,384,349
Discount, if any, Deducted 0 0 0
Unearned Premiums 3,531,213 2,763,599 2,530,975
Earned Premiums 5,194,181 3,952,462 3,338,403
Net Investment Income 319,479 354,038 424,207
Current year 4,125,557 3,108,421 2,123,876
Prior years   (183,812) (26,855)
Amortization of Deferred Policy Acquisition Costs 1,214,858 897,677 762,232
Paid Claims and Claim Adjustment Expenses 2,224,102 2,004,628 1,098,054
Net Premiums Written $ 5,939,375 $ 4,096,333 $ 3,381,493