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Schedule III. Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Policy Acquisition Costs | $ 335,325 | $ 199,380 | $ 110,059
Future Policy Benefits, Losses, Claims and Loss Expenses | 2,848,294 | 2,767,045 | 1,412,510
Unearned Premiums | 1,231,573 | 889,102 | 512,386
Premium Revenue | 1,403,430 | 1,400,551 | 1,062,416
Net Investment Income | 181,726 | 152,567 | 124,316
Benefits, Claims, Losses and Settlement Expenses | 530,831 | 448,238 | 197,947
Amortization of Deferred Policy Acquisition Costs | 289,323 | 238,592 | 144,476
Other Operating Expenses | 197,749 | 219,112 | 190,639
Net Written Premiums | 1,535,312 | 1,416,183 | 1,068,236
Property |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Policy Acquisition Costs | 46,938 | 39,763 | 41,161
Future Policy Benefits, Losses, Claims and Loss Expenses | 627,774 | 706,199 | 634,725
Unearned Premiums | 289,080 | 272,050 | 280,238
Premium Revenue | 720,951 | 805,985 | 698,416
Net Investment Income | 0 | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 151,545 | 128,290 | 16,643
Amortization of Deferred Policy Acquisition Costs | 97,594 | 94,249 | 66,262
Other Operating Expenses | 108,642 | 118,666 | 117,943
Net Written Premiums | 725,321 | 726,145 | 662,552
Casualty and Specialty |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Policy Acquisition Costs | 288,387 | 159,617 | 68,898
Future Policy Benefits, Losses, Claims and Loss Expenses | 2,195,126 | 2,033,168 | 736,099
Unearned Premiums | 942,493 | 617,052 | 232,148
Premium Revenue | 682,337 | 594,614 | 363,632
Net Investment Income | 0 | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 380,396 | 320,818 | 187,441
Amortization of Deferred Policy Acquisition Costs | 191,729 | 144,095 | 84,762
Other Operating Expenses | 88,984 | 100,180 | 72,393
Net Written Premiums | 809,848 | 690,086 | 405,340
Other |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Policy Acquisition Costs | 0 | 0 | 0
Future Policy Benefits, Losses, Claims and Loss Expenses | 25,394 | 27,678 | 41,686
Unearned Premiums | 0 | 0 | 0
Premium Revenue | 142 | (48) | 368
Net Investment Income | 181,726 | 152,567 | 124,316
Benefits, Claims, Losses and Settlement Expenses | (1,110) | (870) | (6,137)
Amortization of Deferred Policy Acquisition Costs | 0 | 248 | (6,548)
Other Operating Expenses | 123 | 266 | 303
Net Written Premiums | $ 143 | $ (48) | $ 344

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- Definition Amount of amortization of deferred policy acquisition costs recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of insurance benefits, claims, losses and settlement expenses incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force on the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of reserves for future policy claims payable and loss expenses to be incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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