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Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current provision:      
Federal $ (164) $ 3,074 $ 4,280
State (84) 260 429
Total current (benefit) provision (248) 3,334 4,709
Deferred provision:      
Federal expense (benefit) 573 (21,582) (2,713)
Total deferred expense (benefit) 573 (21,582) (2,713)
Total income tax expense (benefit) $ 325 $ (18,248) $ 1,996