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RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
United States    
Change in benefit obligation:    
Service cost $ 2,849 $ 2,420
Interest cost 1,720 1,748
Components of net periodic benefit cost:    
Service cost 2,849 2,420
Interest cost 1,720 1,748
Expected return on plan assets (2,814) (2,464)
Amortization of net loss 1,218 801
Net periodic benefit cost 2,973 2,505
Minimum funding requirements 0  
Foreign Plans    
Change in benefit obligation:    
Service cost 1,531 1,337
Interest cost 472 424
Change in plan assets:    
Employer contribution 800  
Components of net periodic benefit cost:    
Service cost 1,531 1,337
Interest cost 472 424
Expected return on plan assets (679) (568)
Amortization of net loss 446 447
Amortization of prior service cost 129 94
Net periodic benefit cost 1,899 $ 1,734
Expected contribution in current fiscal year $ 3,100