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Schedule III. Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | $ 476,661 | $ 426,551 | $ 335,325
Future Policy Benefits, Losses, Claims and Loss Expenses | 6,076,271 | 5,080,408 | 2,848,294
Unearned Premiums | 1,716,021 | 1,477,609 | 1,231,573
Premium Revenue | 1,976,129 | 1,717,575 | 1,403,430
Net Investment Income | 261,866 | 222,209 | 181,726
Benefits, Claims, Losses and Settlement Expenses | 1,120,018 | 1,861,428 | 530,831
Amortization of Deferred Policy Acquisition Costs | 432,989 | 346,892 | 289,323
Other Operating Expenses | 178,267 | 160,778 | 197,749
Net Written Premiums | 2,131,902 | 1,871,325 | 1,535,312
Property |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | 66,656 | 63,583 | 46,938
Future Policy Benefits, Losses, Claims and Loss Expenses | 3,086,254 | 2,486,390 | 627,774
Unearned Premiums | 379,943 | 347,032 | 289,080
Premium Revenue | 1,050,831 | 931,070 | 720,951
Net Investment Income | 0 | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 497,895 | 1,297,985 | 151,545
Amortization of Deferred Policy Acquisition Costs | 177,912 | 113,816 | 97,594
Other Operating Expenses | 112,954 | 94,194 | 108,642
Net Written Premiums | 1,055,188 | 978,014 | 725,321
Casualty and Specialty |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | 410,005 | 362,968 | 288,387
Future Policy Benefits, Losses, Claims and Loss Expenses | 2,985,393 | 2,575,492 | 2,195,126
Unearned Premiums | 1,336,078 | 1,130,577 | 942,493
Premium Revenue | 925,298 | 786,501 | 682,337
Net Investment Income | 0 | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 622,320 | 565,026 | 380,396
Amortization of Deferred Policy Acquisition Costs | 255,079 | 233,077 | 191,729
Other Operating Expenses | 64,883 | 66,548 | 88,984
Net Written Premiums | 1,076,714 | 893,307 | 809,848
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 | 4,624 | 18,526 | 25,394
Unearned Premiums | 0 | 0 | 0
Premium Revenue | 0 | 4 | 142
Net Investment Income | 261,866 | 222,209 | 181,726
Benefits, Claims, Losses and Settlement Expenses | (197) | (1,583) | (1,110)
Amortization of Deferred Policy Acquisition Costs | (2) | (1) | 0
Other Operating Expenses | 430 | 36 | 123
Net Written Premiums | $ 0 | $ 4 | $ 143

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