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SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION (DETAILS) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule III - Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs $ 407,527 $ 359,300 $ 302,320
Reserve For Losses and Loss Expenses 8,425,045 7,032,375 6,564,133
Unearned Premiums 2,454,462 2,333,676 2,209,397
Net Premiums Earned 3,314,961 2,947,410 2,791,764
Net Investment Income 362,430 406,892 464,478
Losses and Loss Expenses 2,675,052 1,677,132 1,423,872
Amortization of Deferred Acquisition Costs 587,469 488,712 420,495
Other Operating Expenses 459,151 449,885 370,157
Net Premiums Written 3,419,434 3,147,540 2,816,429
Insurance [Member]
     
Schedule III - Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 142,743 119,323 87,818
Reserve For Losses and Loss Expenses 4,081,741 3,512,002 3,502,680
Unearned Premiums 1,412,699 1,359,668 1,293,529
Net Premiums Earned 1,429,687 1,206,493 1,157,966
Net Investment Income 0 0 0
Losses and Loss Expenses 919,319 569,869 612,694
Amortization of Deferred Acquisition Costs 199,583 152,223 113,187
Other Operating Expenses 278,147 276,435 216,954
Net Premiums Written 1,466,134 1,332,220 1,025,061
Reinsurance [Member]
     
Schedule III - Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 264,784 239,977 214,502
Reserve For Losses and Loss Expenses 4,343,304 3,520,373 3,061,453
Unearned Premiums 1,041,763 974,008 915,868
Net Premiums Earned 1,885,274 1,740,917 1,633,798
Net Investment Income 0 0 0
Losses and Loss Expenses 1,755,733 1,107,263 811,178
Amortization of Deferred Acquisition Costs 387,886 336,489 307,308
Other Operating Expenses 103,915 98,001 76,127
Net Premiums Written 1,953,300 1,815,320 1,791,368
Unallocated To Segment [Member]
     
Schedule III - 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 362,430 406,892 464,478
Losses and Loss Expenses 0 0 0
Amortization of Deferred Acquisition Costs 0 0 0
Other Operating Expenses 77,089 75,449 77,076
Net Premiums Written $ 0 $ 0 $ 0