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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Domestic Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 39 $ 35
Interest cost 4,050 4,653
Expected return on plan assets (5,711) (6,245)
Amortization of prior service cost 0 0
Amortization of net loss 203 413
Defined benefit plans (1,419) (1,144)
Multi-employer plans 0 0
Defined contribution plans 5,626 5,908
Total pension cost 4,207 4,764
Foreign Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 756 728
Interest cost 696 936
Expected return on plan assets (1,007) (1,124)
Amortization of prior service cost 15 16
Amortization of net loss 555 585
Defined benefit plans 1,015 1,141
Multi-employer plans 269 247
Defined contribution plans 702 499
Total pension cost $ 1,986 $ 1,887