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Income Taxes (Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current tax expense (benefit):      
Federal $ 19,351 $ (3,031) $ 13,846
State 1,135 573 82
Total current tax expense (benefit) 20,486 (2,458) 13,928
Deferred tax expense (benefit):      
Federal (10,303) 12,297 (2,175)
State (177) 106 457
Total deferred tax expense (benefit) (10,480) 12,403 (1,718)
Total income tax expense $ 10,006 $ 9,945 $ 12,210