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Significant Accounting Policies Impact of New Accounting Pronouncement (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Other operating costs and expenses $ 36,170 $ 15,903 $ 76,785 $ 50,011
Net income (7,829) (13,068) 21,401 36,549
Earnings per common share - assuming dilution $ (0.13) $ (0.22) $ 0.34 $ 0.59
Accounting Standards Update 2010-26 Financial Services—Insurance (Topic 944): Accounting for Costs Associated with Acquiring orRenewing Insurance Contracts [Member]
        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Other operating costs and expenses 2,200   7,200  
Net income $ 1,500   $ 4,600  
Earnings per common share - assuming dilution $ 0.02   $ 0.07