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FAIR VALUE MEASUREMENTS - Estimated FV (Details)
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2019
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Oct. 01, 2019
Aug. 02, 2019
Fair value measurements                
Financial Designation, Predecessor and Successor [Fixed List] Successor Successor Successor Predecessor Successor Predecessor    
6.75% senior notes due 2025                
Fair value measurements                
Interest rate (as a percent)             6.75% 6.75%