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Income Taxes (Schedule of Federal and State Income Tax Provision) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal, current $ 31,393 $ 31,382 $ 25,797
State, current 5,678 5,849 5,019
Current 37,071 37,231 30,816
Deferred:      
Federal, deferred 10,181 (2,774) (10,429)
State, deferred 1,197 (483) (1,775)
Deferred $ 11,378 $ (3,257) $ (12,204)