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SHARE CAPITAL (Tables)
 12 Months Ended
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