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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (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 Disclosure [Line Items]        
Service cost $ 4,015 $ 3,826 $ 12,082 $ 6,801
Interest cost 4,483 4,844 13,520 7,170
Expected return on plan assets (8,691) (8,399) (26,139) (12,001)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 103 (1) 311 52
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement     19 0
Net periodic benefit cost (90) 270 (245) 2,022
Defined Benefit Plan, Service Cost 4,015 3,826 12,082 6,801
Defined Benefit Plan, Plan Assets, Contributions by Employer 2,400 2,200 8,100 4,000
UNITED STATES        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 764 824 2,291 944
Interest cost 2,018 2,299 6,095 2,565
Expected return on plan assets (4,414) (4,041) (13,241) (4,498)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 0 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement     19 0
Net periodic benefit cost (1,632) (918) (4,874) (989)
Defined Benefit Plan, Service Cost 764 824 2,291 944
Foreign Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3,251 3,002 9,791 5,857
Interest cost 2,465 2,545 7,425 4,605
Expected return on plan assets (4,277) (4,358) (12,898) (7,503)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 103 (1) 311 52
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement     0 0
Net periodic benefit cost 1,542 1,188 4,629 3,011
Defined Benefit Plan, Service Cost 3,251 3,002 9,791 5,857
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Other Nonoperating Gains (Losses) $ (4,100) $ (3,600) (12,300) $ (4,800)
Defined Benefit Plan, Plan Assets, Contributions by Employer     $ 10,400