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CHAPTER 11 CASES AND ABILITY TO CONTINUE AS A GOING CONCERN - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 21, 2021 | Nov. 02, 2020 | Oct. 31, 2020 | Aug. 18, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Secured credit facility |  |  |  |  |  | $ 3,616,293 |
Prepetition charges |  |  | $ 23,883 |  |  | 23,883 |
Reorganization items |  | $ 35,977 |  |  |  | 35,977 |
Professional fees |  | 10,347 |  |  |  |  |
Unamortized deferred financing costs and debt discounts |  | 25,294 |  |  |  |  |
U.S. Trustee fees |  | $ 336 |  |  |  |  |
Liabilities subject to compromise |  |  |  |  |  | 2,551,490 |
Interest expense |  |  |  |  |  | $ 30,084 |
Series D Preferred Stock |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Dividend rate of preferred stock (as a percent) |  | 7.375% |  |  |  | 7.375% | 7.375%
Series E Preferred Stock |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Dividend rate of preferred stock (as a percent) |  | 6.625% |  |  |  | 6.625% | 6.625%
Senior Unsecured Notes |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Liabilities subject to compromise |  |  |  |  |  | $ 1,375,000 |
Secured Line of Credit |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Liabilities subject to compromise |  |  |  |  |  | 675,926 |
Secured Term Loan |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Liabilities subject to compromise |  |  |  |  |  | 438,750 |
Unpaid Accrued Interest |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Liabilities subject to compromise |  |  |  |  |  | 57,644 |
Prepetition Unsecured Or Under Secured Liabilities |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Liabilities subject to compromise |  |  |  |  |  | $ 4,170 |
Restructuring Support Agreement | Subsequent Event |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Aggregate outstanding principal amount of debt | 96.00% |  |  |  |  |  |
Elimination of debt as result of implementation of plan | $ 1,681,900 |  |  |  | $ 1,681,900 |  |
Principal amount of unsecured notes | 1,375,000 |  |  |  | 1,375,000 |  |
New senior secured notes | 555,000 |  |  |  | 555,000 |  |
Cash | 95,000 |  |  |  | 95,000 |  |
Convertible secured notes | $ 100,000 |  |  |  | $ 100,000 |  |
Percentage of issuance of new common equity to holders of unsecured notes | 89.00% |  |  |  | 89.00% |  |
Restructuring Support Agreement | Subsequent Event | Secured Credit Facility |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Secured credit facility | $ 133,000 |  |  |  | $ 133,000 |  |
Restructuring Support Agreement | Subscription Option | Subsequent Event |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Cash | 100,000 |  |  |  | 100,000 |  |
Convertible secured notes | $ 50,000 |  |  |  | $ 50,000 |  |
Percentage of issuance of new common equity to holders of unsecured notes | 11.00% |  |  |  | 11.00% |  |
Restructuring Support Agreement | Subscription Option | Subsequent Event | Secured Credit Facility |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Secured credit facility | $ 983,700 |  |  |  | $ 983,700 |  |
Restructuring Support Agreement | Subscription Option | Subsequent Event | Secured Term Loan |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Secured credit facility | $ 883,700 |  |  |  | $ 883,700 |  |
Restructuring Support Agreement | Senior Unsecured Notes | 2023 Notes |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of senior unsecured notes |  |  |  | $ 450,000 |  |  |
Interest rate percentage |  |  |  | 5.25% |  |  |
Debt instrument, maturity date |  |  |  | Dec. 01, 2023 |  |  |
Restructuring Support Agreement | Senior Unsecured Notes | 2024 Notes |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of senior unsecured notes |  |  |  | $ 300,000 |  |  |
Interest rate percentage |  |  |  | 4.60% |  |  |
Debt instrument, maturity date |  |  |  | Oct. 15, 2024 |  |  |
Restructuring Support Agreement | Senior Unsecured Notes | 2026 Notes |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of senior unsecured notes |  |  |  | $ 625,000 |  |  |
Interest rate percentage |  |  |  | 5.95% |  |  |
Debt instrument, maturity date |  |  |  | Dec. 15, 2026 |  |  |
Minimum | Restructuring Support Agreement |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of operating partnership |  |  |  | 62.00% |  |  |
Minimum | Restructuring Support Agreement | Subsequent Event |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of operating partnership | 69.00% |  |  |  |  |  |

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