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REMEDIAL LIABILITIES (Anticipated Payments) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Accrual for Environmental Loss Contingencies, Net [Abstract] |  |  |
2021 | $ 12,718 |  |
2022 | 19,275 |  |
2023 | 11,420 |  |
2024 | 9,073 |  |
2025 | 6,526 |  |
Thereafter | 75,915 |  |
Undiscounted remedial liabilities | 134,927 |  |
Less: Discount | (20,114) |  |
Total remedial liabilities | $ 114,813 | $ 114,173 | $ 121,017

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