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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Company-administered plans:        
Curtailment loss $ 6,000      
Contribution to pension plans 38,000   $ 74,000  
Expected plan contributions 76,000   76,000  
Pension benefits     95,000  
Other comprehensive income (loss), defined benefit plan, settlement and curtailment gain (loss), after tax     68,000  
Pension Plan        
Company-administered plans:        
Net pension expense 12,982 $ 12,455 26,711 $ 36,435
Pension Plan | Company-administered plans        
Company-administered plans:        
Service cost 2,967 2,449 8,921 8,264
Interest cost 17,463 21,301 52,348 64,165
Expected return on plan assets (24,304) (22,350) (72,515) (67,615)
Curtailment loss 6,303 0 6,303 0
Net actuarial loss 7,597 8,170 22,749 23,212
Prior service cost 187 167 559 533
Net pension expense 10,213 9,737 18,365 28,559
Pension Plan | Company-administered plans | U.S.        
Company-administered plans:        
Net pension expense 12,215 11,067 25,048 33,199
Pension Plan | Company-administered plans | Non-U.S.        
Company-administered plans:        
Net pension expense (2,002) (1,330) (6,683) (4,640)
Pension Plan | Union-administered plans        
Company-administered plans:        
Net pension expense $ 2,769 $ 2,718 $ 8,346 $ 7,876