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Schedule VI - Supplementary Information For Property and Casualty Insurance Underwriters (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]      
Net Losses and Loss Adjustment Expenses Incurred Related to Current Year $ 4,851,051 $ 3,297,037 $ 3,162,818
Net Losses and Loss Adjustment Expenses Incurred Related to Prior Years (161,452) (163,585) (272,712)
Consolidated Subsidiaries      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]      
Deferred Acquisition Costs 790,708 633,400 569,574
Reserves for Losses and Loss Adjustment Expenses 16,513,929 13,891,842 11,853,297
Discount, if any, deducted in Column C 23,326 22,012 21,145
Unearned Premiums 4,838,965 4,339,549 3,753,636
Net Premiums Earned 6,991,935 5,786,498 5,231,975
Net investment income 519,608 627,738 563,633
Net Losses and Loss Adjustment Expenses Incurred Related to Current Year 4,851,051 3,297,037 3,162,818
Net Losses and Loss Adjustment Expenses Incurred Related to Prior Years (161,452) (163,585) (272,712)
Amortization of Deferred Acquisition Costs 1,004,842 840,945 805,135
Net Paid Losses and Loss Adjustment Expenses 2,661,117 2,383,255 2,206,164
Net Premiums Written $ 7,437,716 $ 6,039,067 $ 5,346,747