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Income Taxes (Schedule of Federal and State Income Tax Provision) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal, current $ 17,574 $ 20,232 $ 31,393
State, current 3,859 3,987 5,678
Current 21,433 24,219 37,071
Deferred:      
Federal, deferred (3,265) 1,865 10,181
State, deferred (387) (580) 1,197
Deferred $ (3,652) $ 1,285 $ 11,378