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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