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Income Taxes (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]      
Expected federal tax on income $ 39,981 $ 45,308 $ 51,140
Add (deduct) tax effects of:      
Tax-exempt interest (5,789) (6,678) (6,849)
Dividend received deduction (3,985) (3,564) (3,566)
Other, net 260 904 1,145
Income tax expense provided on income $ 30,467 $ 35,970 $ 41,870