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SHARE CAPITAL, ADDITIONAL PAID-IN CAPITAL AND CONTRIBUTED SURPLUS (Narrative) (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Stockholders' Equity Note [Abstract]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 2,461 0
Share capital, par value (in dollars per share) $ 0.01 $ 0.01
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 12.30