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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
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | $ 663,991 | $ 476,661 | $ 426,551
Future Policy Benefits, Losses, Claims and Loss Expenses | 9,384,349 | 6,076,271 | 5,080,408
Unearned Premiums | 2,530,975 | 1,716,021 | 1,477,609
Premium Revenue | 3,338,403 | 1,976,129 | 1,717,575
Net Investment Income | 423,833 | 261,866 | 222,209
Benefits, Claims, Losses and Settlement Expenses | 2,097,021 | 1,120,018 | 1,861,428
Amortization of Deferred Policy Acquisition Costs | 762,232 | 432,989 | 346,892
Other Operating Expenses | 222,733 | 178,267 | 160,778
Net Written Premiums | 3,381,493 | 2,131,902 | 1,871,325
Property |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | 79,795 | 66,656 | 63,583
Future Policy Benefits, Losses, Claims and Loss Expenses | 4,073,850 | 3,086,254 | 2,486,390
Unearned Premiums | 539,183 | 379,943 | 347,032
Premium Revenue | 1,627,494 | 1,050,831 | 931,070
Net Investment Income | 0 | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 965,424 | 497,895 | 1,297,985
Amortization of Deferred Policy Acquisition Costs | 313,761 | 177,912 | 113,816
Other Operating Expenses | 139,015 | 112,954 | 94,194
Net Written Premiums | 1,654,259 | 1,055,188 | 978,014
Casualty and Specialty |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | 584,196 | 410,005 | 362,968
Future Policy Benefits, Losses, Claims and Loss Expenses | 5,310,059 | 2,985,393 | 2,575,492
Unearned Premiums | 1,991,792 | 1,336,078 | 1,130,577
Premium Revenue | 1,710,909 | 925,298 | 786,501
Net Investment Income | 0 | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 1,131,637 | 622,320 | 565,026
Amortization of Deferred Policy Acquisition Costs | 448,678 | 255,079 | 233,077
Other Operating Expenses | 84,546 | 64,883 | 66,548
Net Written Premiums | 1,727,234 | 1,076,714 | 893,307
Other |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | 0 | 0 | 0
Future Policy Benefits, Losses, Claims and Loss Expenses | 440 | 4,624 | 18,526
Unearned Premiums | 0 | 0 | 0
Premium Revenue | 0 | 0 | 4
Net Investment Income | 423,833 | 261,866 | 222,209
Benefits, Claims, Losses and Settlement Expenses | (40) | (197) | (1,583)
Amortization of Deferred Policy Acquisition Costs | (207) | (2) | (1)
Other Operating Expenses | (828) | 430 | 36
Net Written Premiums | $ 0 | $ 0 | $ 4

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