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Income Taxes (Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current:      
Federal $ 0 $ 0 $ 0
State 591 810 100
Total current income tax expense 591 810 100
Deferred:      
Federal 930 114 (5,530)
State (866) 574 1,471
Total deferred income tax expense (benefit) 64 688 (4,059)
Income tax expense (benefit) $ 655 $ 1,498 $ (3,959)