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FRESH START ACCOUNTING (Reorganization Adjustment to Retained Earnings (Accumulated Deficit)) (Details) - USD ($) $ in Thousands	4 Months Ended	5 Months Ended
	Sep. 30, 2021	May 17, 2021	Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]
Professional fees earned at Emergence	$ 0	$ (81,565)
Retained earnings (accumulated deficit)	$ (670,899)	0	$ (4,472,859)
Extinguishment of Predecessor common stock and paid in capital
Reorganization, Chapter 11 [Line Items]
Retained earnings (accumulated deficit)		4,221,864
Recognition of counterparty credits due to settlements effectuated at Emergence
Reorganization, Chapter 11 [Line Items]
Retained earnings (accumulated deficit)		4,247
Deferred compensation earned at Emergence
Reorganization, Chapter 11 [Line Items]
Retained earnings (accumulated deficit)		(2,073)
Extinguishment of Predecessor accumulated other comprehensive income
Reorganization, Chapter 11 [Line Items]
Retained earnings (accumulated deficit)		(40,430)
Write-off of debt issuance costs related to First-Out Term Loan
Reorganization, Chapter 11 [Line Items]
Retained earnings (accumulated deficit)		(3,150)
Severance costs incurred as a result of the Plan
Reorganization, Chapter 11 [Line Items]
Retained earnings (accumulated deficit)		(5,961)
Rights offering backstop commitment fee
Reorganization, Chapter 11 [Line Items]
Retained earnings (accumulated deficit)		(5,000)
Extinguishment of Predecessor stock-based compensation
Reorganization, Chapter 11 [Line Items]
Retained earnings (accumulated deficit)		(4,418)
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Gain on settlement of liabilities subject to compromise		658,358
Professional fees earned at Emergence		(18,047)
Retained earnings (accumulated deficit)		$ 4,805,390

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