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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
United States        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 48 $ 39 $ 97 $ 78
Interest cost 3,072 4,051 6,053 8,101
Expected return on plan assets (4,198) (5,711) (8,707) (11,422)
Amortization of prior service cost 0 0    
Amortization of net loss 670 203 1,251 406
Settlement charges (1) 1,650 3,334 6,090 3,334
Defined benefit plans 1,242 1,916 4,784 497
Multi-employer plans 0 0    
Defined contribution plans 5,872 4,751 11,034 10,377
Total pension cost 7,114 6,667 15,818 10,874
Non-U.S.        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 324 742 795 1,498
Interest cost 392 683 1,008 1,379
Expected return on plan assets (537) (1,014) (1,509) (2,021)
Amortization of prior service cost (1) 16 11 31
Amortization of net loss 11 540 446 1,095
Settlement charges (1) 0 0 446  
Defined benefit plans 189 967 1,197 1,982
Multi-employer plans 258 257 502 526
Defined contribution plans 553 773 1,398 1,475
Total pension cost $ 1,000 $ 1,997 $ 3,097 $ 3,983