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SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION (DETAILS) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | $ 471,782 | $ 466,987 | $ 456,122
Reserve for Losses and Loss Expenses | 9,646,285 | 9,596,797 | 9,582,140
Unearned Premiums | 2,760,889 | 2,735,376 | 2,683,849
Net Premiums Earned | 3,686,417 | 3,870,999 | 3,707,065
Net Investment Income | 305,336 | 342,766 | 409,312
Losses And Loss Expenses | 2,176,199 | 2,186,722 | 2,134,195
Amortization of Deferred Acquisition Costs | 718,112 | 737,197 | 664,191
Other Operating Expenses | 596,821 | 621,876 | 575,390
Net Premiums Written | 3,674,666 | 3,906,975 | 3,928,200
Insurance [Member] |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 119,186 | 135,111 | 150,109
Reserve for Losses and Loss Expenses | 5,291,218 | 5,063,147 | 4,873,184
Unearned Premiums | 1,494,068 | 1,506,925 | 1,548,653
Net Premiums Earned | 1,798,191 | 1,830,544 | 1,722,762
Net Investment Income | 0 | 0 | 0
Losses And Loss Expenses | 1,154,928 | 1,131,880 | 1,050,402
Amortization of Deferred Acquisition Costs | 261,208 | 278,804 | 242,363
Other Operating Expenses | 341,658 | 341,214 | 347,684
Net Premiums Written | 1,759,359 | 1,779,501 | 1,813,538
Reinsurance [Member] |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 352,596 | 331,876 | 306,013
Reserve for Losses and Loss Expenses | 4,355,067 | 4,533,650 | 4,708,956
Unearned Premiums | 1,266,821 | 1,228,451 | 1,135,196
Net Premiums Earned | 1,888,226 | 2,040,455 | 1,984,303
Net Investment Income | 0 | 0 | 0
Losses And Loss Expenses | 1,021,271 | 1,054,842 | 1,083,793
Amortization of Deferred Acquisition Costs | 456,904 | 458,393 | 421,828
Other Operating Expenses | 145,253 | 144,987 | 137,450
Net Premiums Written | 1,915,307 | 2,127,474 | 2,114,662
Corporate, Non-Segment [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 | 305,336 | 342,766 | 409,312
Losses And Loss Expenses | 0 | 0 | 0
Amortization of Deferred Acquisition Costs | 0 | 0 | 0
Other Operating Expenses | 109,910 | 135,675 | 90,256
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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