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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 0 $ 0 $ 0
State 0 0 2
Current Income Tax Expense (Benefit) 0 0 2
Deferred:      
Federal 0 (1,594) 18
State 0 (504) 9
Deferred Income Tax Expense (Benefit) 0 (2,098) 27
Income Tax Expense (Benefit) $ 0 $ (2,098) $ 29