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SHAREHOLDERS EQUITY - Stock based compensation - Stock Options Activity (Details) - Stock options - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at beginning of year (in shares) 419,197  
Outstanding at end of period (in shares) 419,197  
Options fully vested / exercisable at end of period (in shares) 414,727 394,020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning Balance $ 29.02  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance 29.02  
Options fully vested / exercisable at December 31, 2019 $ 29.04  
Weighted Average Remaining Contractual Term    
Outstanding at end of year 2 years 6 months  
Options fully vested / exercisable at December 31, 2019 2 years 6 months  
Aggregate Intrinsic Value    
Exercise price low range $ 20.00  
Exercise price high range $ 40.00  
Expiry period 10 years