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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