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Schedule III. Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Policy Acquisition Costs | $ 426,551 | $ 335,325 | $ 199,380
Future Policy Benefits, Losses, Claims and Loss Expenses | 5,080,408 | 2,848,294 | 2,767,045
Unearned Premiums | 1,477,609 | 1,231,573 | 889,102
Premium Revenue | 1,717,575 | 1,403,430 | 1,400,551
Net Investment Income | 222,209 | 181,726 | 152,567
Benefits, Claims, Losses and Settlement Expenses | 1,861,428 | 530,831 | 448,238
Amortization of Deferred Policy Acquisition Costs | 346,892 | 289,323 | 238,592
Other Operating Expenses | 160,778 | 197,749 | 219,112
Net Written Premiums | 1,871,325 | 1,535,312 | 1,416,183
Property |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Policy Acquisition Costs | 63,583 | 46,938 | 39,763
Future Policy Benefits, Losses, Claims and Loss Expenses | 2,486,390 | 627,774 | 706,199
Unearned Premiums | 347,032 | 289,080 | 272,050
Premium Revenue | 931,070 | 720,951 | 805,985
Net Investment Income | 0 | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 1,297,985 | 151,545 | 128,290
Amortization of Deferred Policy Acquisition Costs | 113,816 | 97,594 | 94,249
Other Operating Expenses | 94,194 | 108,642 | 118,666
Net Written Premiums | 978,014 | 725,321 | 726,145
Casualty and Specialty |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Policy Acquisition Costs | 362,968 | 288,387 | 159,617
Future Policy Benefits, Losses, Claims and Loss Expenses | 2,575,492 | 2,195,126 | 2,033,168
Unearned Premiums | 1,130,577 | 942,493 | 617,052
Premium Revenue | 786,501 | 682,337 | 594,614
Net Investment Income | 0 | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 565,026 | 380,396 | 320,818
Amortization of Deferred Policy Acquisition Costs | 233,077 | 191,729 | 144,095
Other Operating Expenses | 66,548 | 88,984 | 100,180
Net Written Premiums | 893,307 | 809,848 | 690,086
Other |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Policy Acquisition Costs | 0 | 0 | 0
Future Policy Benefits, Losses, Claims and Loss Expenses | 18,526 | 25,394 | 27,678
Unearned Premiums | 0 | 0 | 0
Premium Revenue | 4 | 142 | (48)
Net Investment Income | 222,209 | 181,726 | 152,567
Benefits, Claims, Losses and Settlement Expenses | (1,583) | (1,110) | (870)
Amortization of Deferred Policy Acquisition Costs | (1) | 0 | 248
Other Operating Expenses | 36 | 123 | 266
Net Written Premiums | $ 4 | $ 143 | $ (48)

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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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