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Fresh-Start Accounting - All Other Adjustments (Details) - Fresh-Start Adjustments
$ in Thousands
Feb. 28, 2017
USD ($)
Reorganization Items [Line Items]  
Increase in greenhouse gas allowances $ 30,000
Joint venture investment 1,000
Increase in greenhouse gas emissions liabilities 4,000
Decrease in asset retirement obligations 30,000
Decrease in intangible liabilities 6,000
Increase in greenhouse gas emissions liabilities 19,000
Change from entitlements method to sales method  
Reorganization Items [Line Items]  
Change in accounting policy for gas production imbalances 200
Decrease in current portion of intangible liabilities $ 500