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Income Taxes, Income Tax (Benefit) Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current [Abstract]      
Federal $ (7,460) $ 1,067 $ 379
State 1,246 1,867 (7)
Foreign 234 0 0
Total current income tax (benefit) expense (5,980) 2,934 372
Deferred [Abstract]      
Federal 0 0 0
State 0 0 0
Total deferred income tax (benefit) expense 0 0 0
Income tax (benefit) expense $ (5,980) $ 2,934 $ 372