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Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Acquisition Costs | $ 622,053 | $ 581,863 | $ 511,573
Reverse for Losses and Loss Adjustment Expenses | 16,398,997 | 13,611,313 | 13,119,090
Unearned Premium Reserves | 3,501,359 | 3,056,735 | 2,517,612
Premiums Earned | 8,681,513 | 7,403,686 | 6,931,699
Net Investment Income | 642,465 | 647,139 | 581,183
Incurred Loss and Loss Adjustment Expenses | 6,550,837 | 4,922,898 | 5,651,403
Amortization of Deferred Acquisition Costs | 1,873,250 | 1,703,726 | 1,519,030
Other Operating Expenses | 511,237 | 440,899 | 371,541
Net Written Premium | 9,116,983 | 7,824,424 | 7,414,428
Domestic Country [Member] |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Acquisition Costs | 341,836 | 358,108 | 334,818
Reverse for Losses and Loss Adjustment Expenses | 9,501,573 | 7,823,095 | 8,154,003
Unearned Premium Reserves | 2,206,378 | 2,014,712 | 1,695,208
Premiums Earned | 5,123,460 | 4,383,837 | 4,167,619
Net Investment Income | 341,797 | 320,923 | 287,002
Incurred Loss and Loss Adjustment Expenses | 3,920,837 | 2,761,871 | 3,849,982
Amortization of Deferred Acquisition Costs | 1,063,266 | 1,007,282 | 835,823
Other Operating Expenses | 409,912 | 348,861 | 288,933
Net Written Premium | 5,313,490 | 4,605,731 | 4,350,157
International Country [Member] |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Acquisition Costs | 85,678 | 66,183 | 54,253
Reverse for Losses and Loss Adjustment Expenses | 2,781,210 | 2,655,458 | 2,209,202
Unearned Premium Reserves | 430,227 | 344,222 | 261,611
Premiums Earned | 1,752,244 | 1,475,669 | 1,439,882
Net Investment Income | 37,208 | 37,297 | 34,965
Incurred Loss and Loss Adjustment Expenses | 1,074,727 | 1,193,816 | 992,704
Amortization of Deferred Acquisition Costs | 399,908 | 342,400 | 364,010
Other Operating Expenses | 45,757 | 41,690 | 39,042
Net Written Premium | 1,854,813 | 1,551,753 | 1,458,745
Bermuda Country [Member] |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Acquisition Costs | 194,539 | 157,572 | 122,502
Reverse for Losses and Loss Adjustment Expenses | 4,116,214 | 3,132,760 | 2,755,885
Unearned Premium Reserves | 864,754 | 697,801 | 560,793
Premiums Earned | 1,805,809 | 1,544,180 | 1,324,198
Net Investment Income | 263,460 | 288,919 | 259,216
Incurred Loss and Loss Adjustment Expenses | 1,555,273 | 967,211 | 808,717
Amortization of Deferred Acquisition Costs | 410,076 | 354,044 | 319,197
Other Operating Expenses | 55,568 | 50,348 | 43,566
Net Written Premium | $ 1,948,680 | $ 1,666,940 | $ 1,605,526

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