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SHAREHOLDERS EQUITY - Stock based compensation - Stock Options Activity (Details) - Stock options - $ / shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
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    
Granted (in shares)   0  
Outstanding at end of period (in shares) 419,197    
Options fully vested / exercisable at end of period (in shares) 396,916   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 $ 29.20    
Weighted Average Remaining Contractual Term      
Outstanding at end of year 3 years 4 months 24 days    
Options fully vested / exercisable at December 31, 2019 3 years 2 months 12 days    
Aggregate Intrinsic Value      
Exercise price low range $ 20.00    
Exercise price high range $ 40.00    
Expiry period 10 years