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RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Domestic Plans          
Change in benefit obligation:          
Service cost $ 2,433   $ 2,260 $ 4,853 $ 4,520
Interest cost 1,757   1,694 3,505 3,388
Change in plan assets:          
Employer contribution   $ 20,000      
Components of net periodic benefit cost:          
Service cost 2,433   2,260 4,853 4,520
Interest cost 1,757   1,694 3,505 3,388
Expected return on plan assets (2,475)   (2,117) (4,939) (4,235)
Amortization of net loss 801   821 1,602 1,642
Net periodic benefit cost 2,516   2,658 5,021 5,315
Minimum funding requirements       0  
Expected contribution in current fiscal year       24,000  
Foreign Plans          
Change in benefit obligation:          
Service cost 1,382   1,163 2,719 2,301
Interest cost 438   482 862 955
Change in plan assets:          
Employer contribution       1,500  
Components of net periodic benefit cost:          
Service cost 1,382   1,163 2,719 2,301
Interest cost 438   482 862 955
Expected return on plan assets (586)   (556) (1,154) (1,101)
Amortization of net loss 460   393 907 777
Amortization of prior service cost 98   89 192 176
Net periodic benefit cost $ 1,792   $ 1,571 3,526 $ 3,108
Expected contribution in current fiscal year       $ 2,500