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Share capital (Schedule of Stock Options Outstanding and Exercisable) (Details) shares in Thousands | Dec. 31, 2017 CAD shares yr | Dec. 31, 2016 CAD shares | Dec. 31, 2015 CAD shares
--- | --- | --- | ---
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding | shares | 2,316 | 1,771 | 1,516
Weighted average exercise price | CAD 3.06 | CAD 4.64 | CAD 9.5
Exercisable | shares | 1,341 |  |
Weighted average exercise price | CAD 2.84 |  |
CAD 2.00 to 3.00 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Weighted average remaining contractual life (years) | yr | 0.78 |  |
Outstanding | shares | 1,163 |  |
Weighted average exercise price | CAD 2.14 |  |
Exercisable | shares | 899 |  |
Weighted average exercise price | CAD 2.17 |  |
CAD 2.00 to 3.00 [Member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 2 |  |
CAD 2.00 to 3.00 [Member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | CAD 3 |  |
CAD 3.01 to 4.00 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Weighted average remaining contractual life (years) | yr | 2.07 |  |
Outstanding | shares | 1,050 |  |
Weighted average exercise price | CAD 3.85 |  |
Exercisable | shares | 350 |  |
Weighted average exercise price | CAD 3.85 |  |
CAD 3.01 to 4.00 [Member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 3.01 |  |
CAD 3.01 to 4.00 [Member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | CAD 4 |  |
CAD 4.01 to 5.00 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Weighted average remaining contractual life (years) | yr | 1.75 |  |
Outstanding | shares | 25 |  |
Weighted average exercise price | CAD 4.59 |  |
Exercisable | shares | 14 |  |
Weighted average exercise price | CAD 4.63 |  |
CAD 4.01 to 5.00 [Member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 4.01 |  |
CAD 4.01 to 5.00 [Member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | CAD 5 |  |
CAD 5.01 to 6.00 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Weighted average remaining contractual life (years) | yr | 0.41 |  |
Outstanding | shares | 78 |  |
Weighted average exercise price | CAD 5.65 |  |
Exercisable | shares | 78 |  |
Weighted average exercise price | CAD 5.65 |  |
CAD 5.01 to 6.00 [Member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 5.01 |  |
CAD 5.01 to 6.00 [Member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | CAD 6 |  |

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