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LITIGATION (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2017
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 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 (16,677,000) $ 5,376,000   (29,055,000) $ (26,105,000)          
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax 797,000 575,000   (2,362,000) 1,923,000          
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (223,206,000) (218,612,000)   (223,206,000) (218,612,000) $ (206,529,000) $ (194,151,000) $ (223,988,000) $ (192,507,000)  
AOCI, Derivative Qualifying as Hedge, Excluded Component, after Tax (94,000) (215,000)   (94,000) (215,000) (148,000) (413,000) (198,000) 0  
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (20,328,000) 24,221,000   (20,328,000) 24,221,000 21,125,000 (22,690,000) 24,796,000 26,144,000  
Accumulated other comprehensive loss (243,628,000) (243,048,000)   (243,628,000) (243,048,000) $ (227,802,000) $ (217,254,000) $ (248,982,000) $ (218,651,000)  
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax 54,000 (17,000)   319,000 (215,000)          
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, before Tax, Parent 54,000 $ (17,000)   319,000 $ (215,000)          
Accrual for Environmental Loss Contingencies, Payments       11.5            
Accrual for Environmental Loss Contingencies, Gross 11.5     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