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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%