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SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION - Stock option information (Details)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Options outstanding  
Number (in shares) | shares 1,996,509
Options exercisable  
Number (in shares) | shares 1,225,924
Up to $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 480,003 [1]
Weighted average remaining contractual life 1 year 6 months 11 days [1]
Weighted average exercise price (in dollars per share) $ 9.14 [1]
Options exercisable  
Number (in shares) | shares 480,003 [1]
Weighted average remaining contractual life 1 year 6 months 11 days [1]
Weighted average exercise price (in dollars per share) $ 9.14 [1]
$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 298,137 [1]
Weighted average remaining contractual life 7 years 10 months 28 days [1]
Weighted average exercise price (in dollars per share) $ 18.74 [1]
Options exercisable  
Number (in shares) | shares 101,438 [1]
Weighted average remaining contractual life 7 years 9 months 7 days [1]
Weighted average exercise price (in dollars per share) $ 18.65 [1]
$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 916,491 [1]
Weighted average remaining contractual life 5 years 11 months 5 days [1]
Weighted average exercise price (in dollars per share) $ 25.74 [1]
Options exercisable  
Number (in shares) | shares 520,159 [1]
Weighted average remaining contractual life 3 years 10 months 17 days [1]
Weighted average exercise price (in dollars per share) $ 23.79 [1]
$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 109,003 [1]
Weighted average remaining contractual life 7 years 7 months 17 days [1]
Weighted average exercise price (in dollars per share) $ 32.46 [1]
Options exercisable  
Number (in shares) | shares 43,729 [1]
Weighted average remaining contractual life 4 years 11 months 16 days [1]
Weighted average exercise price (in dollars per share) $ 32.83 [1]
$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 [1]
Weighted average remaining contractual life 7 years 11 months 9 days [1]
Weighted average exercise price (in dollars per share) $ 49.06 [1]
Options exercisable  
Number (in shares) | shares 625 [1]
Weighted average remaining contractual life 7 years 11 months 9 days [1]
Weighted average exercise price (in dollars per share) $ 49.06 [1]
$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 [1]
Weighted average remaining contractual life 5 years 2 months 9 days [1]
Weighted average exercise price (in dollars per share) $ 60.73 [1]
Options exercisable  
Number (in shares) | shares 51,375 [1]
Weighted average remaining contractual life 5 years 2 months 9 days [1]
Weighted average exercise price (in dollars per share) $ 60.74 [1]
$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 [1]
Weighted average remaining contractual life 7 years 10 months 10 days [1]
Weighted average exercise price (in dollars per share) $ 72.78 [1]
Options exercisable  
Number (in shares) | shares 3,125 [1]
Weighted average remaining contractual life 7 years 10 months 10 days [1]
Weighted average exercise price (in dollars per share) $ 72.78 [1]
$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 [1]
Weighted average remaining contractual life 7 years 15 days [1]
Weighted average exercise price (in dollars per share) $ 85.63 [1]
Options exercisable  
Number (in shares) | shares 13,438 [1]
Weighted average remaining contractual life 6 years 5 months 16 days [1]
Weighted average exercise price (in dollars per share) $ 84.52 [1]
$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 50,000 [1]
Weighted average remaining contractual life 7 years 2 months 5 days [1]
Weighted average exercise price (in dollars per share) $ 95.40 [1]
Options exercisable  
Number (in shares) | shares 11,094 [1]
Weighted average remaining contractual life 7 years 1 month 13 days [1]
Weighted average exercise price (in dollars per share) $ 94.30 [1]
$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 [1]
Weighted average remaining contractual life 7 years 4 months 13 days [1]
Weighted average exercise price (in dollars per share) $ 105.11 [1]
Options exercisable  
Number (in shares) | shares 938 [1]
Weighted average remaining contractual life 7 years 4 months 13 days [1]
Weighted average exercise price (in dollars per share) $ 105.11 [1]
[1] These options contain market-based components as described above.