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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Premiums written:        
Direct $ 507,520,000 $ 447,595,000 $ 983,486,000 $ 870,937,000
Assumed 4,747,000 1,537,000 26,736,000 7,190,000
Ceded premiums written (86,704,000) (74,629,000) (164,487,000) (141,789,000)
Net 425,563,000 374,503,000 845,735,000 736,338,000
Premiums earned:        
Direct 463,330,000 418,977,000 915,318,000 831,856,000
Assumed 16,039,000 5,351,000 31,088,000 11,240,000
Ceded premiums earned (87,157,000) (68,748,000) (175,365,000) (136,173,000)
Net 392,212,000 355,580,000 771,041,000 706,923,000
Losses and loss expenses incurred:        
Direct 301,451,000 296,963,000 553,654,000 566,367,000
Assumed 10,470,000 3,739,000 21,069,000 7,572,000
Ceded losses and loss expenses incurred (24,018,000) (26,147,000) (33,914,000) (50,178,000)
Net 287,903,000 274,555,000 540,809,000 523,761,000
Incurred Property And Casualty Catastrophe Losses 30,200,000 38,100,000 37,100,000 44,900,000
Decrease in ceded losses and loss expenses $ 2,100,000   $ 16,300,000