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Income Taxes - Difference between Income Taxes Computed at Federal Statutory Rate and Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Expected income tax benefit at statutory rate $ (25,370) $ (25,800)
Permanent differences (357) 511
Remeasurement of deferred balances due to federal rate change (4,140)  
Net operating loss write down   49,608
State tax, tax effected 97 (20)
Prior year differences 779 311
Other (28) 376
Total income tax (benefit) expense $ (29,019) $ 24,986