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SHAREHOLDERS EQUITY - Stock based compensation - Stock Options Activity (Details) - Stock Options - $ / shares
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at beginning of year (in shares) 592,714  
Forfeited or expired (in shares) (38,775)  
Outstanding at end of period (in shares) 553,939  
Options fully vested / exercisable at June 30, 2018 (in shares) 440,762 458,942
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 $ 29.24  
Forfeited or expired (in dollars per share) 26.50  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance 29.44  
Options fully vested / exercisable at June 30, 2018 $ 30.92  
Weighted Average Remaining Contractual Term    
Outstanding at end of year 5 years  
Options fully vested / exercisable at June 30, 2018 4 years 6 months  
Aggregate Intrinsic Value    
Exercise price low range $ 20.00  
Exercise price high range $ 40.00  
Expiry period 10 years