GOODWILL (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 718,587	$ 718,078
Effect of foreign currency translation	237	509
Goodwill, ending balance	718,824	718,587
United States [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	692,639	692,639
Effect of foreign currency translation	0	0
Goodwill, ending balance	692,639	692,639
International [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	25,948	25,439
Effect of foreign currency translation	237	509
Goodwill, ending balance	$ 26,185	$ 25,948