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Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current provision:      
Federal $ 3,074 $ 4,280 $ 6,440
State 260 429 523
Total current provision 3,334 4,709 6,963
Deferred provision:      
Federal benefit (21,582) (2,713) (1,846)
Total deferred benefit (21,582) (2,713) (1,846)
Total income tax expense (benefit) $ (18,248) $ 1,996 $ 5,117