Fresh Start Accounting - Liabilities subject to compromise settled (Details) - USD ($) $ in Thousands		11 Months Ended
	Nov. 19, 2018	Nov. 19, 2018
Liabilities Subject to Compromise [Abstract]
Gain on settlement of liabilities subject to compromise		$ 794,218
Reorganization Adjustments
Liabilities Subject to Compromise [Abstract]
Gain on settlement of liabilities subject to compromise	$ 794,218
Reorganization Adjustments | Liabilities Subject To Compromise
Liabilities Subject to Compromise [Abstract]
Increase (decrease ) in liabilities subject to compromise	3,084,874
Reorganization Adjustments | Unconsolidated Subsidiaries
Liabilities Subject to Compromise [Abstract]
Increase (decrease ) in liabilities subject to compromise	(488)
Reorganization Adjustments | Payment Of Debt | 2013 Revolving Credit Facility
Liabilities Subject to Compromise [Abstract]
Increase (decrease ) in liabilities subject to compromise	(475,000)
Reorganization Adjustments | Payment Of Debt | Senior Secured Credit Facility
Liabilities Subject to Compromise [Abstract]
Increase (decrease ) in liabilities subject to compromise	(661,478)
Reorganization Adjustments | Reinstatement Of Claims Expected To Be Paid
Liabilities Subject to Compromise [Abstract]
Increase (decrease ) in liabilities subject to compromise	(1,247)
Reorganization Adjustments | Issuance Of Successor Common Shares to Holders Of Debt
Liabilities Subject to Compromise [Abstract]
Increase (decrease ) in liabilities subject to compromise	$ (1,152,443)