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Segment Information (Details) - Net premiums earned by line of business (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
P&C Operations:                      
P&C Operations                 $ 5,765,982 $ 5,327,112 $ 5,031,137
Life Operations:                      
Life Operations                 324,459 363,018 382,924
Total                 6,090,441 5,690,130 5,414,061
Life Operations Segment [Member]
                      
Life Operations:                      
Life Operations                 324,459 363,018 382,924
Total 80,829 79,487 85,623 78,520 90,323 90,794 92,214 89,687 324,459 363,018 382,924
Total P And C Segment [Member]
                      
Life Operations:                      
Total 1,538,559 1,468,553 1,400,972 1,357,898 1,386,759 1,362,532 1,306,125 1,271,696 5,765,982 5,327,112 5,031,137
Insurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 3,924,640 3,663,727 3,529,138
Life Operations:                      
Total                 3,924,640 3,663,727 3,529,138
Reinsurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 1,841,342 1,663,385 1,501,999
Life Operations:                      
Total                 1,841,342 1,663,385 1,501,999
Professional | Total P And C Segment [Member]
                      
P&C Operations:                      
P&C Operations                 1,563,650 1,501,180 1,538,893
Professional | Insurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 1,350,328 1,287,231 1,316,173
Professional | Reinsurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 213,322 213,949 222,720
Casualty | Total P And C Segment [Member]
                      
P&C Operations:                      
P&C Operations                 1,469,069 1,255,179 1,098,441
Casualty | Insurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 1,157,909 998,326 879,287
Casualty | Reinsurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 311,160 256,853 219,154
Property catastrophe | Total P And C Segment [Member]
                      
P&C Operations:                      
P&C Operations                 463,977 387,523 323,588
Property catastrophe | Insurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 0 0 0
Property catastrophe | Reinsurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 463,977 387,523 323,588
Property | Total P And C Segment [Member]
                      
P&C Operations:                      
P&C Operations                 1,103,038 1,052,187 951,228
Property | Insurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 489,743 464,576 416,806
Property | Reinsurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 613,295 587,611 534,422
Marine, energy, aviation and satellite | Total P And C Segment [Member]
                      
P&C Operations:                      
P&C Operations                 147,370 130,855 88,855
Marine, energy, aviation and satellite | Insurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 0 0 0
Marine, energy, aviation and satellite | Reinsurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 147,370 130,855 88,855
Specialty | Total P And C Segment [Member]
                      
P&C Operations:                      
P&C Operations                 708,564 702,604 682,518
Specialty | Insurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 708,564 702,604 682,518
Specialty | Reinsurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 0 0 0
Other | Total P And C Segment [Member]
                      
P&C Operations:                      
P&C Operations                 310,314 [1] 297,584 [1] 347,614 [1]
Other | Insurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 218,096 [1] 210,990 [1] 234,354 [1]
Other | Reinsurance Segment [Member]
                      
P&C Operations:                      
P&C Operations                 92,218 [1] 86,594 [1] 113,260 [1]
Annuity
                      
Life Operations:                      
Life Operations                 126,912 132,232 255,905
Annuity | Life Operations Segment [Member]
                      
Life Operations:                      
Life Operations                 126,912 132,232 255,905
Other life
                      
Life Operations:                      
Life Operations                 197,547 230,786 127,019
Other life | Life Operations Segment [Member]
                      
Life Operations:                      
Life Operations                 $ 197,547 $ 230,786 $ 127,019
[1] Other within the Insurance segment includes: excess and surplus, surety, structured indemnity and certain other discontinued lines. Other within the Reinsurance segment includes: whole account contracts, structured indemnity and other lines.