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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan, expense $ 24,241 $ 19,697 $ 16,607
U.S. 401(k) Plan      
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan, expense 8,109 6,676 5,506
International plans      
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan, expense $ 16,132 $ 13,021 $ 11,101