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GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF GOODWILL (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Beginning balance January 1 $ 1,771,877 $ 1,730,950
Goodwill, Translation Adjustments (49,274) 40,927
Ending balance December 31 $ 1,722,603 $ 1,771,877