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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Narrative (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
plan
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
PENSIONS AND OTHER POSTRETIREMENT BENEFITS      
Increase (decrease) in basis point drop in discount rate (110.00%) 70.00%  
Employer matching contribution, percent of match (up to) 3.00%    
United States      
PENSIONS AND OTHER POSTRETIREMENT BENEFITS      
Pension expense $ 4,300,000 $ 3,900,000 $ 5,500,000
Foreign Plan      
PENSIONS AND OTHER POSTRETIREMENT BENEFITS      
Pension expense $ 1,800,000 1,700,000 $ 1,000,000.0
Pension Benefits      
PENSIONS AND OTHER POSTRETIREMENT BENEFITS      
Number of plans | plan 2    
Transfer to U.S. retirement savings plan $ 2,000,000.0 0  
Estimated future employer contributions $ 0    
Pension Benefits | Return seeking (growth assets) funds      
PENSIONS AND OTHER POSTRETIREMENT BENEFITS      
Target plan asset allocations (percent) 54.00%    
Pension Benefits | Fixed income funds      
PENSIONS AND OTHER POSTRETIREMENT BENEFITS      
Target plan asset allocations (percent) 46.00%    
Pension Benefits | Nonunion Pension Plan | United States      
PENSIONS AND OTHER POSTRETIREMENT BENEFITS      
Number of plans | plan 1    
Other Benefits      
PENSIONS AND OTHER POSTRETIREMENT BENEFITS      
Number of plans | plan 4    
Transfer to U.S. retirement savings plan $ 0 $ 0  
Estimated future employer contributions $ 200,000    
Other Benefits | Nonunion Pension Plan | United States      
PENSIONS AND OTHER POSTRETIREMENT BENEFITS      
Number of plans | plan 1