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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair value of financial assets and liabilities carried at fair value |  |
Derivative Assets | $ 0 | $ 0
Derivative Liabilities | 0 | 0
Level 2 |  |
Fair value of financial assets and liabilities carried at fair value |  |
Aggregate carrying value of total debt | 2,226,251 | 2,364,676
Estimated fair value of total debt | $ 2,363,150 | $ 2,571,300

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