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SHARE-BASED PAYMENTS - Share option plan changes (Details) - Share options Options in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 CAD ($) Options | Dec. 31, 2017 CAD ($) Options
Number and weighted average exercise prices of share options |  |
Balance at January 1 | Options | 12,173 | 12,429
Granted | Options | 1,950 | 1,669
Exercised | Options | (301) | (265)
Forfeited | Options | (238) | (1,567)
Expired | Options | (1,240) | (93)
Outstanding at end of period | Options | 12,344 | 12,173
Exercisable at end of period | Options | 8,861 | 8,539
Balance at January 1 | $ 6.52 | $ 6.95
Granted | 4.95 | 5.06
Exercised | 3.65 | 4.09
Forfeited | 4.87 | 8.74
Expired | 12.58 | 7.38
Outstanding at end of period | 5.77 | 6.52
Weighted average exercise price at end of period | 6.13 | $ 7.41
Weighted average share price at the date of exercise | $ 4.87 |

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