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GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF GOODWILL (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]    
Beginning balance January 1 $ 1,681,662 $ 1,735,440
Goodwill, Translation Adjustments 21,434 (113,719)
Additions to goodwill for acquisitions 17,618 59,941
Ending balance December 31 $ 1,720,714 $ 1,681,662