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SHARE-BASED PAYMENTS - Share option plan changes (Details) - Share options Options in Thousands | 12 Months Ended
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Dec. 31, 2017 CAD ($) Options | Dec. 31, 2016 CAD ($) Options
Number and weighted average exercise prices of share options |  |
Balance at January 1 | Options | 12,429 | 13,513
Granted | Options | 1,669 | 1,872
Exercised | Options | (265) | (708)
Forfeited | Options | (1,567) | (1,300)
Expired | Options | (93) | (948)
Outstanding at end of period | Options | 12,173 | 12,429
Exercisable at end of period | Options | 8,539 | 7,911
Balance at January 1 | $ 6.95 | $ 7.57
Granted | 5.06 | 4.17
Exercised | 4.09 | 5.17
Forfeited | 8.74 | 6.57
Expired | 7.38 | 12.17
Outstanding at end of period | 6.52 | 6.95
Weighted average exercise price at end of period | 7.41 | $ 8.51
Weighted average share price at the date of exercise | $ 5.51 |

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