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SHAREHOLDERS EQUITY - Stock based compensation - Stock Options Activity (Details) - Stock options - $ / shares
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at beginning of year (in shares) 419,197  
Granted (in shares) 0 0
Forfeited or expired (in shares) (34,050)  
Outstanding at end of period (in shares) 385,147  
Options fully vested / exercisable at end of period (in shares) 381,577  
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  
Forfeited or expired (in dollars per share) 36.43  
Options, Outstanding, Weighted Average Exercise Price, Ending Balance 28.36  
Options fully vested / exercisable $ 28.38  
Weighted Average Remaining Contractual Term    
Outstanding at end of year 2 years 2 months 12 days  
Options fully vested / exercisable 2 years 2 months 12 days  
Aggregate Intrinsic Value    
Exercise price low range $ 20.00  
Exercise price high range $ 40.00  
Expiry period 10 years