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Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Acquisition Costs | $ 581,863 | $ 511,573 | $ 411,587
Reverse for Losses and Loss Adjustment Expenses | 13,611,313 | 13,119,090 | 11,884,321
Unearned Premium Reserves | 3,056,735 | 2,517,612 | 2,000,556
Premiums Earned | 7,403,686 | 6,931,699 | 5,937,840
Net Investment Income | 647,139 |  |
Incurred Loss and Loss Adjustment Expenses | 4,922,898 | 5,651,403 | 4,522,581
Amortization of Deferred Acquisition Costs | 1,703,726 | 1,519,030 | 1,303,963
Other Operating Expenses | 440,899 | 371,541 | 318,817
Net Written Premium | 7,824,424 | 7,414,428 | 6,244,661
Domestic Country [Member] |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Acquisition Costs | 358,108 | 334,818 | 289,636
Reverse for Losses and Loss Adjustment Expenses | 7,823,095 | 8,154,003 | 7,254,043
Unearned Premium Reserves | 2,014,712 | 1,695,208 | 1,460,291
Premiums Earned | 4,383,837 | 4,167,619 | 3,642,547
Net Investment Income | 320,923 |  |
Incurred Loss and Loss Adjustment Expenses | 2,761,871 | 3,849,982 | 2,727,649
Amortization of Deferred Acquisition Costs | 1,007,282 | 835,823 | 712,568
Other Operating Expenses | 348,861 | 288,933 | 241,962
Net Written Premium | 4,605,731 | 4,350,157 | 3,875,982
International Country [Member] |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Acquisition Costs | 66,183 | 54,253 | 53,186
Reverse for Losses and Loss Adjustment Expenses | 2,655,458 | 2,209,202 | 2,175,500
Unearned Premium Reserves | 344,222 | 261,611 | 253,626
Premiums Earned | 1,475,669 | 1,439,882 | 1,202,043
Net Investment Income | 37,297 |  |
Incurred Loss and Loss Adjustment Expenses | 1,193,816 | 992,704 | 1,059,640
Amortization of Deferred Acquisition Costs | 342,400 | 364,010 | 287,688
Other Operating Expenses | 41,690 | 39,042 | 38,844
Net Written Premium | 1,551,753 | 1,458,745 | 1,229,597
Bermuda Country [Member] |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Acquisition Costs | 157,572 | 122,502 | 68,765
Reverse for Losses and Loss Adjustment Expenses | 3,132,760 | 2,755,885 | 2,454,778
Unearned Premium Reserves | 697,801 | 560,793 | 286,639
Premiums Earned | 1,544,180 | 1,324,198 | 1,093,250
Net Investment Income | 288,919 |  |
Incurred Loss and Loss Adjustment Expenses | 967,211 | 808,717 | 735,292
Amortization of Deferred Acquisition Costs | 354,044 | 319,197 | 303,707
Other Operating Expenses | 50,348 | 43,566 | 38,011
Net Written Premium | $ 1,666,940 | $ 1,605,526 | $ 1,139,082

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