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Voluntary Reorganization under Chapter 11 of the Bankruptcy Code - Components of Liabilities Subject to Compromise (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Reorganizations [Abstract]
Accounts payable and accrued liabilities	$ 113,287
Senior unsecured notes	1,825,757
Accrued interest on senior unsecured notes	50,337
Asset retirement obligations	57,306
Other liabilities	24,171
Total liabilities subject to compromise	2,070,858	$ 0
Contractual interest expense on Notes not recognized in Company's Condensed Consolidated Statements of Operations	$ 300

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