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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
United States    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 49 $ 39
Interest cost 2,981 4,050
Expected return on plan assets (4,509) (5,711)
Amortization of prior service cost 0 0
Amortization of net loss 581 203
Settlement charges (1) 4,440 0
Defined benefit plans 3,542 (1,419)
Multi-employer plans 0 0
Defined contribution plans 5,162 5,626
Total pension cost 8,704 4,207
Foreign Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 471 756
Interest cost 616 696
Expected return on plan assets (972) (1,007)
Amortization of prior service cost 12 15
Amortization of net loss 435 555
Settlement charges (1) 446 0
Defined benefit plans 1,008 1,015
Multi-employer plans 244 269
Defined contribution plans 845 702
Total pension cost $ 2,097 $ 1,986