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Fresh Start Accounting - Enterprise to Reorg values (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Oct. 21, 2016
Oct. 20, 2016
Fresh start accounting adjustments        
Plus: Cash and cash equivalents $ 68,498 $ 76,838 $ 76,540 $ 76,540
Fresh Start Adjustments        
Fresh start accounting adjustments        
Enterprise value     600,000  
Plus: Cash and cash equivalents     76,540  
Plus: other working capital liabilities     60,118  
Plus: other long-term liabilities     14,600  
Reorganization Value     $ 751,258