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SHAREHOLDERS EQUITY - Stock based compensation - Stock Options Activity (Details) - Stock Options - $ / shares
6 Months Ended
Jun. 30, 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) (23,850)  
Outstanding at end of period (in shares) 442,097  
Options fully vested / exercisable at end of period (in shares) 388,216 402,872
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) 26.25  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance 28.98  
Options fully vested / exercisable at June 30, 2018 $ 29.59  
Weighted Average Remaining Contractual Term    
Outstanding at end of year 4 years  
Options fully vested / exercisable at June 30, 2018 3 years 8 months 12 days  
Aggregate Intrinsic Value    
Exercise price low range $ 20.00  
Exercise price high range $ 40.00  
Expiry period 10 years