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RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
United States        
Change in benefit obligation:        
Service cost $ 2,844 $ 2,433 $ 5,693 $ 4,853
Interest cost 1,706 1,757 3,426 3,505
Components of net periodic benefit cost:        
Service cost 2,844 2,433 5,693 4,853
Interest cost 1,706 1,757 3,426 3,505
Expected return on plan assets (2,792) (2,475) (5,606) (4,939)
Amortization of net loss 1,210 801 2,428 1,602
Net periodic benefit cost 2,968 2,516 5,941 5,021
Minimum funding requirements     0  
Foreign Plans        
Change in benefit obligation:        
Service cost 1,491 1,382 3,022 2,719
Interest cost 457 438 929 862
Change in plan assets:        
Employer contribution     1,200  
Components of net periodic benefit cost:        
Service cost 1,491 1,382 3,022 2,719
Interest cost 457 438 929 862
Expected return on plan assets (658) (586) (1,337) (1,154)
Amortization of net loss 433 460 879 907
Amortization of prior service cost 125 98 254 192
Net periodic benefit cost 1,848 $ 1,792 3,747 $ 3,526
Expected contribution in current fiscal year $ 3,100   $ 3,100