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GOODWILL (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]        
Goodwill $ 1,755,679 $ 1,725,547 $ 1,771,877 $ 1,720,714
Goodwill, Foreign Currency Translation Gain (Loss) $ (16,198) $ 4,833