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Schedule VI - Supplementary Information For Property and Casualty Insurance Underwriters (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]      
Net Losses and Loss Adjustment Expenses Incurred Related to Current Year $ 4,940,987 $ 4,851,051 $ 3,297,037
Net Losses and Loss Adjustment Expenses Incurred Related to Prior Years (356,184) (161,452) (163,585)
Consolidated Subsidiaries      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]      
Deferred Acquisition Costs 901,841 790,708 633,400
Reserves for Losses and Loss Adjustment Expenses 17,757,156 16,513,929 13,891,842
Discount, if any, deducted in Column C 55,575 23,326 22,012
Unearned Premiums 6,011,942 4,838,965 4,339,549
Net Premiums Earned 8,082,298 6,991,935 5,786,498
Net investment income 389,118 519,608 627,738
Net Losses and Loss Adjustment Expenses Incurred Related to Current Year 4,940,987 4,851,051 3,297,037
Net Losses and Loss Adjustment Expenses Incurred Related to Prior Years (356,184) (161,452) (163,585)
Amortization of Deferred Acquisition Costs 1,303,178 1,004,842 840,945
Net Paid Losses and Loss Adjustment Expenses 2,826,551 2,661,117 2,383,255
Net Premiums Written $ 9,018,337 $ 7,437,716 $ 6,039,067