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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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