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Basis of Presentation (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Summary of financial statement amounts previously reported            
Total shareholders' equity As previously reported.         $ 1,086,926 $ 880,007
Effect of change in accounting principle, net of taxes:            
Retained earnings 896,683   896,683   840,644  
Total shareholders' equity 1,232,418 1,024,258 1,232,418 1,024,258 1,055,353  
Net income            
As previously reported   23,128   37,252    
Net income 32,266 23,637 72,040 37,593    
Costs Associated with Acquiring or Renewing Insurance Contracts [Member]
            
Effect of change in accounting principle, net of taxes:            
Retained earnings         (34,425) (34,447)
Accumulated other comprehensive income (loss), net of taxes (Net unrealized gains and losses on fixed maturities and equity securities)         2,852 1,531
Total shareholders' equity         1,055,353 847,091
Net income            
Effect of change in accounting principle, net of taxes   509   341    
Net income   $ 23,637   $ 37,593