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SHARE CAPITAL (Tables) | 12 Months Ended
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Dec. 31, 2017
Share Capital, Reserves And Other Equity Interest [Abstract] |
Summary of outstanding common stock |
|  | 2017 |  | 2016
Issued Common shares |  | Number of shares (thousands) |  |  | Amount |  |  | Number of shares (thousands) |  |  | Amount |
Balance – beginning of year |  | 1,110,952 |  |  | $ | 4,671 |  |  | 1,094,668 |  |  | $ | 4,541 |
Issued for the acquisition of AOSP and other assets (note 7) |  | 97,561 |  |  | 3,818 |  |  | — |  |  | — |
Issued upon exercise of stock options |  | 14,256 |  |  | 466 |  |  | 16,284 |  |  | 559 |
Previously recognized liability on stock options exercised for common shares |  | — |  |  | 154 |  |  | — |  |  | 117 |
Return of capital on PrairieSky Royalty Ltd. share distribution (note 8) |  | — |  |  | — |  |  | — |  |  | (546 | )
Balance – end of year |  | 1,222,769 |  |  | $ | 9,109 |  |  | 1,110,952 |  |  | $ | 4,671 |
Summary of stock option activity | The following table summarizes information relating to stock options outstanding at December 31, 2017 and 2016:
|  | 2017 |  | 2016
|  | Stock options (thousands) |  |  | Weighted average exercise price |  |  | Stock options (thousands) |  |  | Weighted average exercise price |
Outstanding – beginning of year |  | 58,299 |  |  | $ | 34.22 |  |  | 74,615 |  |  | $ | 34.88 |
Granted |  | 16,052 |  |  | $ | 42.07 |  |  | 11,002 |  |  | $ | 34.97 |
Surrendered for cash settlement |  | (626 | ) |  | $ | 33.18 |  |  | (817 | ) |  | $ | 34.47 |
Exercised for common shares |  | (14,256 | ) |  | $ | 32.66 |  |  | (16,284 | ) |  | $ | 34.31 |
Forfeited |  | (3,433 | ) |  | $ | 37.53 |  |  | (10,217 | ) |  | $ | 39.66 |
Outstanding – end of year |  | 56,036 |  |  | $ | 36.67 |  |  | 58,299 |  |  | $ | 34.22 |
Exercisable – end of year |  | 18,282 |  |  | $ | 34.25 |  |  | 20,747 |  |  | $ | 33.75 |
Summary of range of exercise prices of stock options outstanding | The range of exercise prices of stock options outstanding and exercisable at December 31, 2017 was as follows:
|  |  |  | Stock options outstanding |  | Stock options exercisable
Range of exercise prices | Stock options outstanding (thousands) |  |  | Weighted average remaining term (years) |  |  | Weighted average exercise price |  |  | Stock options exercisable (thousands) |  |  | Weighted average exercise price |
$22.90 | - | $24.99 |  | 3,657 |  |  | 3.03 |  |  | $ | 22.90 |  |  | 1,116 |  |  | $ | 22.90 |
$25.00 | - | $29.99 |  | 8,390 |  |  | 2.34 |  |  | $ | 28.72 |  |  | 3,967 |  |  | $ | 28.57 |
$30.00 | - | $34.99 |  | 10,047 |  |  | 1.61 |  |  | $ | 33.31 |  |  | 5,557 |  |  | $ | 33.49 |
$35.00 | - | $39.99 |  | 13,523 |  |  | 3.29 |  |  | $ | 37.21 |  |  | 4,190 |  |  | $ | 35.88 |
$40.00 | - | $44.99 |  | 19,417 |  |  | 4.15 |  |  | $ | 43.60 |  |  | 3,118 |  |  | $ | 43.55 |
$45.00 | - | $46.74 |  | 1,002 |  |  | 3.63 |  |  | $ | 45.61 |  |  | 334 |  |  | $ | 45.09 |
|  |  |  | 56,036 |  |  | 3.13 |  |  | $ | 36.67 |  |  | 18,282 |  |  | $ | 34.25 |

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