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LITIGATION (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2017 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2015
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Revision in Estimates |  |  | $ 1,050,000.00 |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies | $ 1,600,000 |  |  | $ 1,600,000 |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent | 14,287,000 | $ 523,000 |  | (12,378,000) | $ (31,481,000) |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax | 692,000 | 40,000 |  | (1,565,000) | 1,348,000 |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | (206,529,000) | (223,988,000) |  | (206,529,000) | (223,988,000) | $ (220,816,000) | $ (194,151,000) | $ (224,511,000) | $ (192,507,000) |
AOCI, Derivative Qualifying as Hedge, Excluded Component, after Tax | (148,000) | (198,000) |  | (148,000) | (198,000) | (373,000) | (413,000) | 0 | 0 |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | (21,125,000) | 24,796,000 |  | (21,125,000) | 24,796,000 | 21,817,000 | (22,690,000) | 24,836,000 | 26,144,000 |
Accumulated other comprehensive loss | (227,802,000) | (248,982,000) |  | (227,802,000) | (248,982,000) | $ (243,006,000) | (217,254,000) | $ (249,347,000) | $ (218,651,000) |
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax | 225,000 | (198,000) |  | 265,000 | (198,000) |  |  |  |  |
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, before Tax, Parent | 225,000 | $ (198,000) |  | 265,000 | $ (198,000) |  |  |  |  |
Accrual for Environmental Loss Contingencies, Payments |  |  |  | 9.2 |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Gross |  |  |  |  |  |  | $ 11.5 |  |  |
Accrued Environmental Loss Contingencies, Noncurrent | $ 1,200,000 |  |  | $ 1,200,000 |  |  |  |  |  |
Judicial Ruling [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual |  |  |  |  |  |  |  |  |  | $ 1,620,000
Unfavorable Regulatory Action [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Revision in Estimates |  |  | $ 5,450,000 |  |  |  |  |  |  |

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