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SHAREHOLDERS EQUITY - Stock based compensation - Stock Options Activity (Details) - Stock Options - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at beginning of year (in shares) 465,947  
Forfeited or expired (in shares) (46,750)  
Outstanding at end of period (in shares) 419,197  
Options fully vested / exercisable at end of period (in shares) 394,020 402,872
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 $ 28.84  
Forfeited or expired (in dollars per share) 27.22  
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 $ 29.24  
Weighted Average Remaining Contractual Term    
Outstanding at end of year 3 years 7 months 6 days  
Options fully vested / exercisable at December 31, 2019 3 years 4 months 24 days  
Aggregate Intrinsic Value    
Exercise price low range $ 20.00  
Exercise price high range $ 40.00  
Expiry period 10 years