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Schedule of Components of Income Tax Provision (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2015
Current:        
Federal $ (91)   $ 247  
State (5)      
Total current tax benefit (provision) (96)   247  
Deferred:        
Federal (7,456) $ (4,091) (8,939)  
State (369) (234) (1,277)  
Total deferred tax benefit (7,825) (4,325) (10,216)  
Income tax benefit $ (7,921) $ (4,325) $ (9,969) $ (9,969)