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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 |

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