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SHAREHOLDERS EQUITY - Stock based compensation - Stock Options Activity (Details) - Stock options
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Sep. 30, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at beginning of year (in shares) | shares 419,197  
Granted (in shares) | shares 0 0
Exercised (in shares) | shares (3,750)  
Forfeited or expired (in shares) | shares (36,050)  
Outstanding at end of period (in shares) | shares 379,397  
Options fully vested / exercisable at end of period (in shares) | shares 375,827  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Options, Outstanding, Weighted Average Exercise Price, Beginning Balance $ 29.02  
Exercised (in dollars per share) 21.00  
Forfeited or expired (in dollars per share) 35.91  
Options, Outstanding, Weighted Average Exercise Price, Ending Balance 28.44  
Options fully vested / exercisable $ 28.46  
Weighted Average Remaining Contractual Term    
Outstanding at end of year 1 year 10 months 24 days  
Options fully vested / exercisable 1 year 9 months 18 days  
Aggregate Intrinsic Value    
Exercise price low range $ 20.00  
Exercise price high range $ 40.00  
Expiry period 10 years