EQUITY AND SHARE-BASED COMPENSATION (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Number of Options
Outstanding at the beginning of the period (in shares)	2,589,343
Granted (in shares)	15,000
Exercised (in shares)	(44,565)
Forfeited (in shares)	(16,001)
Outstanding at the end of the period (in shares)	2,543,777		2,589,343
Exercisable at the end of the period (in shares)	2,216,285
Weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 18.33
Granted (in dollars per share)	$ 105.11	$ 90.75
Exercised (in dollars per share)	$ 14.43
Forfeited (in dollars per share)	$ 73.14
Outstanding at the end of the period (in dollars per share)	$ 18.56		$ 18.33
Exercisable at the end of the period (in dollars per share)	$ 13.28
Weighted average contractual term
Weighted average contractual term	4 years 8 months 16 days		5 years 2 months 12 days
Exercisable at the end of the period	4 years 4 months 6 days
Aggregate intrinsic value
Aggregate intrinsic value (in dollars)	$ 244,590		$ 363,293
Exercisable at the end of the period (in dollars)	$ 224,515