EQUITY AND SHARE-BASED COMPENSATION (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Number of Options
Outstanding at the beginning of the period (in shares)	2,589,343
Exercised (in shares)	(28,538)
Forfeited (in shares)	(13,751)
Outstanding at the end of the period (in shares)	2,547,054	2,589,343
Exercisable at the end of the period (in shares)	2,190,311
Weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 18.33
Exercised (in dollars per share)	$ 14.25
Forfeited (in dollars per share)	$ 81.65
Outstanding at the end of the period (in dollars per share)	$ 18.03	$ 18.33
Exercisable at the end of the period (in dollars per share)	$ 13.03
Weighted average contractual term
Weighted average contractual term	4 years 11 months 5 days	5 years 2 months 12 days
Exercisable at the end of the period	4 years 6 months 25 days
Aggregate intrinsic value
Aggregate intrinsic value (in dollars)	$ 264,079	$ 363,293
Exercisable at the end of the period (in dollars)	$ 237,933