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GOODWILL (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]        
Goodwill $ 1,776,918 $ 1,735,662 $ 1,730,950 $ 1,681,662
Goodwill, Foreign Currency Translation Gain (Loss) 45,968 34,799    
Goodwill, Purchase Accounting Adjustments $ 0 $ 19,201