Annual report pursuant to Section 13 and 15(d)

Bankruptcy Proceedings, Emergence and Fresh Start Accounting Schedule of Cumulative Reorganization Adjustments (Details)

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Bankruptcy Proceedings, Emergence and Fresh Start Accounting Schedule of Cumulative Reorganization Adjustments (Details) - USD ($)
$ in Thousands
8 Months Ended 12 Months Ended
Sep. 12, 2016
Dec. 31, 2018
May 10, 2016
Reorganizations [Abstract]      
Liabilities subject to compromise, gain $ 1,150,248 $ 0  
Fair Value of Equity Allocated to Unsecured Creditors 174,477    
Fair Value of Unsecured Creditors Pending Resolution 10,396    
Backstop Commitment Agreement, Backstop Commitment 6,022   $ 50,000
Postconfirmation, Additional Paid-in Capital 190,895    
Cancellation of Equity Upon Emergence from Bankruptcy 882,992    
Fresh-Start Adjustment, Increase (Decrease), Retained Earnings (Deficit) $ 2,224,135