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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Premiums written:    
Direct $ 475,966,000 $ 423,342,000
Assumed 21,989,000 5,653,000
Ceded premiums written (77,783,000) (67,160,000)
Net 420,172,000 361,835,000
Premiums earned:    
Direct 451,988,000 412,879,000
Assumed 15,049,000 5,889,000
Ceded premiums earned (88,208,000) (67,425,000)
Net 378,829,000 351,343,000
Losses and loss expenses incurred:    
Direct 252,203,000 269,404,000
Assumed 10,599,000 3,833,000
Ceded losses and loss expenses incurred (9,896,000) (24,031,000)
Net 252,906,000 249,206,000
Increase in direct premiums written 52,600,000  
Average of Personal Lines filed rate increases that were effective during the period 5.90%  
Increase in assumed premiums written 16,300,000  
Increase in assumed written premiums earned 9,200,000  
Excess And Surplus Operations [Member]
    
Losses and loss expenses incurred:    
Increase in direct premiums written 13,200,000  
Total Commercial Lines [Member]
    
Losses and loss expenses incurred:    
Renewal pure price 5.10%  
Increase in retention 3  
Retention 83.00%  
Total Personal Lines [Member]
    
Losses and loss expenses incurred:    
Increase in retention 1  
Retention 87.00%  
New Business [Member]
    
Losses and loss expenses incurred:    
Increase in direct premiums written 21,800,000  
Audit And Endorsement Additional Return Premium [Member]
    
Premiums written:    
Direct $ 5,700,000 $ (4,000,000)