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Income Taxes (Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Federal $ (3,031) $ 13,846 $ 8,720
State 573 82 21
Total current tax expense (2,458) 13,928 8,741
Federal 12,297 (2,175) 1,440
State 106 457 358
Total deferred tax expense (benefit) 12,403 (1,718) 1,798
Total income tax expense $ 9,945 $ 12,210 $ 10,539