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Income Taxes (Schedule of Federal and State Income Tax Provision) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal, current $ 20,232 $ 31,393 $ 31,382
State, current 3,987 5,678 5,849
Current 24,219 37,071 37,231
Deferred:      
Federal, deferred 1,865 10,181 (2,774)
State, deferred (580) 1,197 (483)
Deferred $ 1,285 $ 11,378 $ (3,257)