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SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | $ 474,061 | $ 438,636 | $ 471,782
Reserve for Losses and Loss Expenses | 12,997,553 | 9,697,827 | 9,646,285
Unearned Premiums | 3,641,399 | 2,969,498 | 2,760,889
Net Premiums Earned | 4,148,760 | 3,705,625 | 3,686,417
Net Investment Income | 400,805 | 353,335 | 305,336
Losses And Loss Expenses | 3,287,772 | 2,204,197 | 2,176,199
Amortization of Deferred Acquisition Costs | 823,591 | 746,876 | 718,112
Other Operating Expenses | 579,428 | 602,717 | 596,821
Net Premiums Written | 4,027,143 | 3,752,974 | 3,674,666
Insurance |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 152,070 | 128,880 | 119,186
Reserve for Losses and Loss Expenses | 7,164,364 | 5,345,655 | 5,291,218
Unearned Premiums | 2,225,647 | 1,574,164 | 1,494,068
Net Premiums Earned | 2,106,363 | 1,777,321 | 1,798,191
Net Investment Income | 0 | 0 | 0
Losses And Loss Expenses | 1,661,032 | 1,141,933 | 1,154,928
Amortization of Deferred Acquisition Costs | 332,749 | 251,120 | 261,208
Other Operating Expenses | 344,012 | 346,857 | 341,658
Net Premiums Written | 2,087,734 | 1,807,125 | 1,759,359
Reinsurance |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 321,991 | 309,756 | 352,596
Reserve for Losses and Loss Expenses | 5,833,189 | 4,352,172 | 4,355,067
Unearned Premiums | 1,415,752 | 1,395,334 | 1,266,821
Net Premiums Earned | 2,042,397 | 1,928,304 | 1,888,226
Net Investment Income | 0 | 0 | 0
Losses And Loss Expenses | 1,626,740 | 1,062,264 | 1,021,271
Amortization of Deferred Acquisition Costs | 490,842 | 495,756 | 456,904
Other Operating Expenses | 105,471 | 135,844 | 145,253
Net Premiums Written | 1,939,409 | 1,945,849 | 1,915,307
Corporate |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 0 | 0 | 0
Reserve for Losses and Loss Expenses | 0 | 0 | 0
Unearned Premiums | 0 | 0 | 0
Net Premiums Earned | 0 | 0 | 0
Net Investment Income | 400,805 | 353,335 | 305,336
Losses And Loss Expenses | 0 | 0 | 0
Amortization of Deferred Acquisition Costs | 0 | 0 | 0
Other Operating Expenses | 129,945 | 120,016 | 109,910
Net Premiums Written | $ 0 | $ 0 | $ 0

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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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