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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Stockholders' Equity Note [Abstract]        
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax $ (165,964) $ (165,964) $ (125,526) $ (132,949)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent (36,113) (28,690)    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax (4,325) (4,325)    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (22,554) (22,554) (23,244) (24,127)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax 690 1,573    
Accumulated other comprehensive loss $ (188,518) $ (188,518) $ (148,770) $ (157,076)