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FAIR VALUE MEASUREMENTS - Estimated FV (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2019 | Dec. 31, 2019 | Oct. 01, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 08, 2019 | Aug. 02, 2019 | Oct. 08, 2018 | Oct. 07, 2017 | Sep. 07, 2017 | Jul. 10, 2017 | Feb. 16, 2017
Fair value measurements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] |  | Predecessor | Successor | Predecessor | Predecessor | Predecessor |  | Predecessor |  |  |  |  |  |  |
12.0% senior secured second lien notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |  |
6.75% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 6.75% |  |  |  |  |  | 6.75% | 6.75% | 6.75% |  |  | 6.75% | 6.75%
Principal amount |  |  |  |  |  | $ 625,005 | [1] |  |  |  |  |  | $ 850,000 | $ 850,000 | $ 850,000
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] |  |  | Successor |  |  | Predecessor |  |  |  |  |  |  |  |  |
Total | 6.75% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of debt | [1] |  |  |  |  | $ 458,210 |  |  |  |  |  |  |  |  |
[1] | The 6.75% senior notes were cancelled on October 8, 2019 upon emergence from chapter 11 bankruptcy.

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