STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Number of Options
Outstanding at the beginning of the period (in shares)	3,058,309
Granted (in shares)	75,000	300,000	200,000
Exercised (in shares)	(401,718)
Forfeited (in shares)	(142,248)
Outstanding at the end of the period (in shares)	2,589,343	3,058,309
Exercisable at the end of the period (in shares)	2,194,755
Weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 17.69
Granted (in dollars per share)	$ 104.84	$ 69.48	$ 33.15
Exercised (in dollars per share)	$ 16.48
Forfeited (in dollars per share)	$ 55.35
Outstanding at the end of the period (in dollars per share)	$ 18.33	$ 17.69
Exercisable at the end of the period (in dollars per share)	$ 12.68
Weighted average contractual term
Weighted average contractual term	5 years 2 months 12 days	6 years 1 month 10 days
Exercisable at the end of the period	4 years 9 months 14 days
Aggregate intrinsic value
Aggregate intrinsic value (in dollars)	$ 363,293	$ 211,072
Exercisable at the end of the period (in dollars)	$ 320,326