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Fresh Start Accounting - Reorganization adj effects (Details) - USD ($)
$ in Thousands
Oct. 21, 2016
Dec. 31, 2016
Dec. 31, 2015
Fresh start accounting adjustments      
Common stock-predecessor $ (247) $ (250)  
Additional paid-in-capital (510,905) $ (514,305)  
Reorganization Adjustments      
Fresh start accounting adjustments      
Gain on settlement of liabilities subject to compromise 1,270,959    
Common stock-predecessor (247)    
Additional paid-in-capital (510,905)    
Predecessor      
Fresh start accounting adjustments      
Common stock-predecessor (104)   $ (110)
Treasury stock (3,134)    
Additional paid-in-capital (891,292)   $ (888,247)
Predecessor | Reorganization Adjustments      
Fresh start accounting adjustments      
Gain on settlement of liabilities subject to compromise 1,270,959    
Common stock-predecessor 104    
Treasury stock (3,134)    
Additional paid-in-capital 891,292    
Net impact to Predecessor accumulated deficit $ 2,159,221