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Emergence from Voluntary Reorganization under Chapter 11 - Schedule of Reorganization Items (Details) - USD ($) $ in Thousands	2 Months Ended	10 Months Ended	12 Months Ended
	Feb. 28, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Reorganizations [Abstract]
Return of undistributed funds from cash distribution pool	$ 0	$ 0	$ 0	$ 22,855
Gain on resolution of pre-emergence liabilities	0	0	0	3,713
Legal and other professional advisory fees	(19,481)	(1,027)	(426)	(3,083)
Gain on settlement of liabilities subject to compromise	421,774	0	0	0
Fresh start valuation adjustments	(920,699)	0	0	0
Other	10,686	(705)	0	1,205
Reorganization items, net	$ (507,720)	$ (1,732)	$ (426)	$ 24,690

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Amount of net gain (loss) on settlement of other claims for entities in bankruptcy, reported as a reorganization item.

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Amount of reorganization items related to legal and advisory professional fees related to entities in bankruptcy.

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