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SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION - Stock option information (Details)
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Options outstanding  
Number (in shares) | shares 687,339
Options exercisable  
Number (in shares) | shares 525,707
$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 127,400
Weighted average remaining contractual life (in years) 3 years 3 months 14 days
Weighted average exercise price (in dollars per share) $ 18.79
Options exercisable  
Number (in shares) | shares 123,238
Weighted average remaining contractual life (in years) 3 years 3 months 14 days
Weighted average exercise price (in dollars per share) $ 18.79
$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 415,710
Weighted average remaining contractual life (in years) 5 years 1 month 17 days
Weighted average exercise price (in dollars per share) $ 24.87
Options exercisable  
Number (in shares) | shares 326,338
Weighted average remaining contractual life (in years) 4 years 11 months 12 days
Weighted average exercise price (in dollars per share) $ 24.84
$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 30,729
Weighted average remaining contractual life (in years) 4 years 7 months 9 days
Weighted average exercise price (in dollars per share) $ 33.10
Options exercisable  
Number (in shares) | shares 18,506
Weighted average remaining contractual life (in years) 4 years 6 months 25 days
Weighted average exercise price (in dollars per share) $ 33.40
$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 58,500
Weighted average remaining contractual life (in years) 2 months 8 days
Weighted average exercise price (in dollars per share) $ 60.76
Options exercisable  
Number (in shares) | shares 43,875
Weighted average remaining contractual life (in years) 2 months 8 days
Weighted average exercise price (in dollars per share) $ 60.76
$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 25,000
Weighted average remaining contractual life (in years) 2 years 7 months 6 days
Weighted average exercise price (in dollars per share) $ 86.69
Options exercisable  
Number (in shares) | shares 6,250
Weighted average remaining contractual life (in years) 2 years 7 months 6 days
Weighted average exercise price (in dollars per share) $ 86.69
$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 30,000
Weighted average remaining contractual life (in years) 2 years 9 months
Weighted average exercise price (in dollars per share) $ 96.87
Options exercisable  
Number (in shares) | shares 7,500
Weighted average remaining contractual life (in years) 2 years 9 months
Weighted average exercise price (in dollars per share) $ 96.87