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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