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GOODWILL (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Goodwill $ 1,740,771 $ 1,722,603
Goodwill, Foreign Currency Translation Gain (Loss) 12,642  
Goodwill, Acquired During Period $ 5,526