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Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income taxes expenses reconciliation      
Expected federal tax on income $ 52,210 $ 33,221 $ 38,560
Add (deduct) tax effects of:      
Tax-exempt interest (6,836) (7,072) (7,034)
Dividend received deduction (2,132) (2,010) (1,660)
Resolution of contingent tax liabilities     (1,429)
Other, net 2,065 273 1,600
Total income tax expense $ 45,307 $ 24,412 $ 30,037