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GOODWILL (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]        
Goodwill $ 1,741,540 $ 1,740,156 $ 1,720,714 $ 1,681,662
Goodwill, Foreign Currency Translation Gain (Loss) 20,826 40,062    
Goodwill, Purchase Accounting Adjustments $ 0 $ 18,432