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Fresh-Start Accounting - Settlement of Liabilities Subject to Compromise (Details) - USD ($)
$ in Thousands
 12 Months Ended
Feb. 28, 2017
Dec. 31, 2018
Liabilities Subject to Compromise    
Liabilities subject to compromise $ 1,000,336  
Funding of the general unsecured claims Cash Distribution Pool (35,000)  
Common stock to holders of Unsecured Notes and general unsecured creditors   $ (133,805)
Reorganization Adjustments    
Liabilities Subject to Compromise    
Accounts payable and accrued expenses 151,298  
Accrued interest payable 15,238  
Debt 833,800  
Liabilities subject to compromise 1,000,336  
Funding of the general unsecured claims Cash Distribution Pool (35,000)  
Common stock to holders of Unsecured Notes and general unsecured creditors (543,562)  
Gains on settlement of liabilities subject to compromise $ 421,774