INTANGIBLE ASSETS AND GOODWILL (Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Balance, beginning of year	$ 2,396,906	$ 3,375,000
Acquisitions	294,200	0
Impairment of goodwill	0	(940,700)	$ 0
Currency translation adjustments	46,565	(37,394)
Balance, end of year	$ 2,737,671	$ 2,396,906	$ 3,375,000