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Adoption of Accounting Pronouncements (Balance Sheet Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred policy acquisition costs $ 214,069 $ 209,627  
Total assets 5,736,369 5,231,772  
Stockholders' Equity 1,109,228 1,071,109 1,002,375
Retrospective Effect Of Change In Accounting Principle As Reported [Member]
      
Deferred policy acquisition costs 214,069 209,627  
Total assets 5,736,369 5,231,772  
Stockholders' Equity 1,109,228 1,071,109  
Book value per share $ 20.39 $ 19.95  
Retrospective Effect Of Change In Accounting Principle As Restated [Member]
      
Deferred policy acquisition costs 135,761 127,984  
Total assets 5,685,469 5,178,704  
Stockholders' Equity $ 1,058,328 $ 1,018,041  
Book value per share $ 19.45 $ 18.97