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SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION - Information about stock options outstanding (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Options outstanding  
Number (in shares) | shares 3,163,125
Options exercisable  
Number (in shares) | shares 2,214,051
$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) | shares 1,575,003
Weighted average remaining contractual life 2 years 6 months 15 days
Weighted average exercise price (in dollars per share) $ 9.14
Options exercisable  
Number (in shares) | shares 1,575,003
Weighted average remaining contractual life 2 years 6 months 15 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) | shares 427,781
Weighted average remaining contractual life 8 years 5 months 9 days
Weighted average exercise price (in dollars per share) $ 18.23
Options exercisable  
Number (in shares) | shares 64,729
Weighted average remaining contractual life 3 years 7 months 28 days
Weighted average exercise price (in dollars per share) $ 15.08
$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) | shares 881,711
Weighted average remaining contractual life 6 years 8 months 23 days
Weighted average exercise price (in dollars per share) $ 25.68
Options exercisable  
Number (in shares) | shares 470,311
Weighted average remaining contractual life 4 years 3 months 26 days
Weighted average exercise price (in dollars per share) $ 23.21
$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) | shares 63,880
Weighted average remaining contractual life 7 years 7 days
Weighted average exercise price (in dollars per share) $ 32.26
Options exercisable  
Number (in shares) | shares 39,880
Weighted average remaining contractual life 5 years 5 months 5 days
Weighted average exercise price (in dollars per share) $ 33.05
$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) | shares 5,000
Weighted average remaining contractual life 8 years 11 months 9 days
Weighted average exercise price (in dollars per share) $ 49.06
Options exercisable  
Number (in shares) | shares 313
Weighted average remaining contractual life 8 years 11 months 9 days
Weighted average exercise price (in dollars per share) $ 49.06
$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) | shares 71,000
Weighted average remaining contractual life 6 years 2 months 9 days
Weighted average exercise price (in dollars per share) $ 60.73
Options exercisable  
Number (in shares) | shares 46,469
Weighted average remaining contractual life 6 years 2 months 9 days
Weighted average exercise price (in dollars per share) $ 60.74
$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) | shares 25,000
Weighted average remaining contractual life 8 years 10 months 13 days
Weighted average exercise price (in dollars per share) $ 72.78
Options exercisable  
Number (in shares) | shares 1,563
Weighted average remaining contractual life 8 years 10 months 13 days
Weighted average exercise price (in dollars per share) $ 72.78
$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) | shares 40,000
Weighted average remaining contractual life 8 years 15 days
Weighted average exercise price (in dollars per share) $ 85.63
Options exercisable  
Number (in shares) | shares 9,063
Weighted average remaining contractual life 7 years 4 months 13 days
Weighted average exercise price (in dollars per share) $ 84.35
$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) | shares 71,875
Weighted average remaining contractual life 8 years 3 months 29 days
Weighted average exercise price (in dollars per share) $ 94.31
Options exercisable  
Number (in shares) | shares 6,251
Weighted average remaining contractual life 8 years 4 days
Weighted average exercise price (in dollars per share) $ 94.26
$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) | shares 1,875
Weighted average remaining contractual life 8 years 4 months 13 days
Weighted average exercise price (in dollars per share) $ 105.11
Options exercisable  
Number (in shares) | shares 469
Weighted average remaining contractual life 8 years 4 months 13 days
Weighted average exercise price (in dollars per share) $ 105.11