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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Contribution to pension plans     $ 2,000  
Expected plan contributions $ 7,000   7,000  
Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 2,442 $ 6,566 5,389 $ 13,729
Pension Plan | Company-administered plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 180 2,741 548 5,954
Interest cost 14,483 17,353 29,018 34,885
Expected return on plan assets (21,791) (23,948) (43,485) (48,211)
Amortization of net actuarial loss and prior service cost 7,031 7,622 14,128 15,524
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total (97) 3,768 209 8,152
Pension Plan | Company-administered plans | U.S.        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 2,090 6,055 4,453 12,833
Pension Plan | Company-administered plans | Non-U.S.        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total (2,187) (2,287) (4,244) (4,681)
Pension Plan | Multi-employer plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ 2,539 $ 2,798 $ 5,180 $ 5,577