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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Contribution to pension plans     $ 5,000  
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 2,712 $ 12,982 8,101 $ 26,711
Pension Plan | Company-administered plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 276 2,967 824 8,921
Interest cost 14,496 17,463 43,514 52,348
Expected return on plan assets (21,702) (24,304) (65,187) (72,515)
Curtailment loss 0 6,303 0 6,303
Amortization of net actuarial loss and prior service cost 7,056 7,784 21,184 23,308
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 126 10,213 335 18,365
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 2,227 12,215 6,680 25,048
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 (2,101) (2,002) (6,345) (6,683)
Pension Plan | Multi-employer plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ 2,586 $ 2,769 $ 7,766 $ 8,346