SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION (Details 3) (USD $)	12 Months Ended
Dec. 31, 2014
Options outstanding
Number (in shares)	2,601,892
Options exercisable
Number (in shares)	2,279,555
$0.00 - $10.00
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)	$ 0.00
Exercise price, high end of range (in dollars per share)	$ 10.00
Options outstanding
Number (in shares)	1,647,654
Weighted average remaining contractual life	3 years 5 months 27 days
Weighted average exercise price (in dollars per share)	$ 9.14
Options exercisable
Number (in shares)	1,647,654
Weighted average remaining contractual life	3 years 5 months 27 days
Weighted average exercise price (in dollars per share)	$ 9.14
$10.01 - $20.00
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)	$ 10.01
Exercise price, high end of range (in dollars per share)	$ 20.00
Options outstanding
Number (in shares)	97,737
Weighted average remaining contractual life	1 year 9 months 18 days
Weighted average exercise price (in dollars per share)	$ 12.45
Options exercisable
Number (in shares)	97,737
Weighted average remaining contractual life	1 year 9 months 18 days
Weighted average exercise price (in dollars per share)	$ 12.45
$20.01 - $30.00
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)	$ 20.01
Exercise price, high end of range (in dollars per share)	$ 30.00
Options outstanding
Number (in shares)	477,061
Weighted average remaining contractual life	5 years 3 months 22 days
Weighted average exercise price (in dollars per share)	$ 23.18
Options exercisable
Number (in shares)	443,624
Weighted average remaining contractual life	5 years 3 months 22 days
Weighted average exercise price (in dollars per share)	$ 23.19
$30.01 - $40.00
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)	$ 30.01
Exercise price, high end of range (in dollars per share)	$ 40.00
Options outstanding
Number (in shares)	48,309
Weighted average remaining contractual life	6 years 3 months 7 days
Weighted average exercise price (in dollars per share)	$ 33.31
Options exercisable
Number (in shares)	28,319
Weighted average remaining contractual life	6 years 4 months 13 days
Weighted average exercise price (in dollars per share)	$ 33.10
$40.01 - $50.00
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)	$ 40.01
Exercise price, high end of range (in dollars per share)	$ 50.00
Options outstanding
Number (in shares)	15,000
Weighted average remaining contractual life	9 years 11 months 9 days
Weighted average exercise price (in dollars per share)	$ 49.06
Options exercisable
Number (in shares)	0
Weighted average remaining contractual life	0 days
Weighted average exercise price (in dollars per share)	$ 0.00
$50.01 - $60.00
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)	$ 50.01
Exercise price, high end of range (in dollars per share)	$ 60.00
Options outstanding
Number (in shares)	10,000
Weighted average remaining contractual life	7 years 4 months 13 days
Weighted average exercise price (in dollars per share)	$ 53.00
Options exercisable
Number (in shares)	6,250
Weighted average remaining contractual life	7 years 4 months 13 days
Weighted average exercise price (in dollars per share)	$ 53.00
$60.01 - $70.00
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)	$ 60.01
Exercise price, high end of range (in dollars per share)	$ 70.00
Options outstanding
Number (in shares)	122,250
Weighted average remaining contractual life	7 years 2 months 9 days
Weighted average exercise price (in dollars per share)	$ 60.68
Options exercisable
Number (in shares)	48,001
Weighted average remaining contractual life	7 years 2 months 9 days
Weighted average exercise price (in dollars per share)	$ 60.70
$70.01 - $80.00
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)	$ 70.01
Exercise price, high end of range (in dollars per share)	$ 80.00
Options outstanding
Number (in shares)	25,600
Weighted average remaining contractual life	9 years 10 months 10 days
Weighted average exercise price (in dollars per share)	$ 72.78
Options exercisable
Number (in shares)	0
Weighted average remaining contractual life	0 days
Weighted average exercise price (in dollars per share)	$ 0.00
$80.01 - $90.00
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)	$ 80.01
Exercise price, high end of range (in dollars per share)	$ 90.00
Options outstanding
Number (in shares)	40,000
Weighted average remaining contractual life	9 years 15 days
Weighted average exercise price (in dollars per share)	$ 85.63
Options exercisable
Number (in shares)	4,688
Weighted average remaining contractual life	8 years 1 month 13 days
Weighted average exercise price (in dollars per share)	$ 83.86
$90.01 - $100.00
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)	$ 90.01
Exercise price, high end of range (in dollars per share)	$ 100.00
Options outstanding
Number (in shares)	73,281
Weighted average remaining contractual life	9 years 3 months 22 days
Weighted average exercise price (in dollars per share)	$ 94.32
Options exercisable
Number (in shares)	1,407
Weighted average remaining contractual life	8 years 1 month 28 days
Weighted average exercise price (in dollars per share)	$ 93.88
$100.01 - $110.00
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)	$ 101.00
Exercise price, high end of range (in dollars per share)	$ 110.00
Options outstanding
Number (in shares)	15,000
Weighted average remaining contractual life	9 years 4 months 13 days
Weighted average exercise price (in dollars per share)	$ 105.11
Options exercisable
Number (in shares)	0
Weighted average remaining contractual life	0 days
Weighted average exercise price (in dollars per share)	$ 0.00
$120.01 - $130.00
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)	$ 120.01
Exercise price, high end of range (in dollars per share)	$ 130.00
Options outstanding
Number (in shares)	30,000
Weighted average remaining contractual life	8 years 7 months 13 days
Weighted average exercise price (in dollars per share)	$ 125.98
Options exercisable
Number (in shares)	1,875
Weighted average remaining contractual life	8 years 7 months 13 days
Weighted average exercise price (in dollars per share)	$ 125.98

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