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GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF GOODWILL (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]    
Beginning balance January 1 $ 1,730,950 $ 1,681,662
Goodwill, Translation Adjustments 40,927 21,434
Ending balance December 31 1,771,877 1,730,950
Goodwill, Purchase Accounting Adjustments 0 17,618
Scenario, Adjustment [Member]    
Goodwill [Roll Forward]    
Beginning balance January 1 10,236  
Ending balance December 31   10,236
Goodwill, Period Increase (Decrease) $ 0 $ 10,236