Annual report pursuant to Section 13 and 15(d)

Bankruptcy Proceedings, Emergence and Fresh Start Accounting Schedule Of Liabilities Subject to Compromise (Details)

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Bankruptcy Proceedings, Emergence and Fresh Start Accounting Schedule Of Liabilities Subject to Compromise (Details) - USD ($)
$ in Thousands
8 Months Ended 12 Months Ended
Sep. 12, 2016
Dec. 31, 2018
Reorganizations [Abstract]    
Liabilities Subject to Compromise, Senior Notes $ 1,075,000  
Liabilities Subject to Compromise, Interest on Senior Notes 47,213  
Liabilities Subject to Compromise, Firm Transportation Obligation 11,077  
Liabilities Subject to Compromise, Compensation 9,733  
Liabilities Subject to Compromise, Deferred Compensation 4,676  
Liabilities Subject to Compromise, Accounts Payable 1,487  
Liabilities Subject to Compromise, Litigation claims 1,092  
Liabilities Subject to Compromise, Other accrued liabilities 3,885  
Liabilities Subject to Compromise 1,154,163  
Cash settlements paid or reserved at emergence 3,915  
Liabilities subject to compromise, gain $ 1,150,248 $ 0