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RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Domestic Plans    
Change in benefit obligation:    
Service cost $ 2,260 $ 2,504
Interest cost 1,694 1,589
Change in plan assets:    
Employer contribution 10,000  
Components of net periodic benefit cost:    
Service cost 2,260 2,504
Interest cost 1,694 1,589
Expected return on plan assets (2,118) (1,898)
Amortization of net loss 821 1,351
Net periodic benefit cost 2,657 3,546
Minimum funding requirements 0  
Foreign Plans    
Change in benefit obligation:    
Service cost 1,138 1,160
Interest cost 473 420
Change in plan assets:    
Employer contribution 800  
Components of net periodic benefit cost:    
Service cost 1,138 1,160
Interest cost 473 420
Expected return on plan assets (545) (455)
Amortization of net loss 384 425
Amortization of prior service cost 87 65
Net periodic benefit cost 1,537 $ 1,615
Expected contribution in current fiscal year $ 5,000