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SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION (DETAILS) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | $ 438,636 | $ 471,782 | $ 466,987
Reserve for Losses and Loss Expenses | 9,697,827 | 9,646,285 | 9,596,797
Unearned Premiums | 2,969,498 | 2,760,889 | 2,735,376
Net Premiums Earned | 3,705,625 | 3,686,417 | 3,870,999
Net Investment Income | 353,335 | 305,336 | 342,766
Losses And Loss Expenses | 2,204,197 | 2,176,199 | 2,186,722
Amortization of Deferred Acquisition Costs | 746,876 | 718,112 | 737,197
Other Operating Expenses | 602,717 | 596,821 | 621,876
Net Premiums Written | 3,752,974 | 3,674,666 | 3,906,975
Insurance [Member] |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 128,880 | 119,186 | 135,111
Reserve for Losses and Loss Expenses | 5,345,655 | 5,291,218 | 5,063,147
Unearned Premiums | 1,574,164 | 1,494,068 | 1,506,925
Net Premiums Earned | 1,777,321 | 1,798,191 | 1,830,544
Net Investment Income | 0 | 0 | 0
Losses And Loss Expenses | 1,141,933 | 1,154,928 | 1,131,880
Amortization of Deferred Acquisition Costs | 251,120 | 261,208 | 278,804
Other Operating Expenses | 346,857 | 341,658 | 341,214
Net Premiums Written | 1,807,125 | 1,759,359 | 1,779,501
Reinsurance [Member] |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 309,756 | 352,596 | 331,876
Reserve for Losses and Loss Expenses | 4,352,172 | 4,355,067 | 4,533,650
Unearned Premiums | 1,395,334 | 1,266,821 | 1,228,451
Net Premiums Earned | 1,928,304 | 1,888,226 | 2,040,455
Net Investment Income | 0 | 0 | 0
Losses And Loss Expenses | 1,062,264 | 1,021,271 | 1,054,842
Amortization of Deferred Acquisition Costs | 495,756 | 456,904 | 458,393
Other Operating Expenses | 135,844 | 145,253 | 144,987
Net Premiums Written | 1,945,849 | 1,915,307 | 2,127,474
Corporate [Member] |  |  |
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 | 353,335 | 305,336 | 342,766
Losses And Loss Expenses | 0 | 0 | 0
Amortization of Deferred Acquisition Costs | 0 | 0 | 0
Other Operating Expenses | 120,016 | 109,910 | 135,675
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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