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Share Capital (Tables)
 12 Months Ended
Dec. 31, 2020
Share Capital, Reserves And Other Equity Interest [Abstract]  
Summary of outstanding common stock
2020

2019
Issued Common shares
Number
of shares
(thousands)
Amount
Number
of shares
(thousands)
Amount
Balance – beginning of year
1,186,857 

$9,533 1,201,886 $9,323 
Issued upon exercise of stock options
3,979 

108 10,871 360 
Previously recognized liability on stock options exercised for common shares
— 

21 — 53 
Purchase of common shares under Normal Course Issuer Bid
(6,970)

(56)(25,900)(203)
Balance – end of year
1,183,866 $9,606 1,186,857 $9,533 
Summary of stock option activity
The following table summarizes information relating to stock options outstanding at December 31, 2020 and 2019:
 
20202019
 
Stock options
(thousands)
Weighted
 average
 exercise price
Stock options
(thousands)
Weighted
 average
 exercise price
Outstanding – beginning of year
47,646 $38.04 46,685 $37.92 
Granted
12,032 $32.89 16,314 $34.84 
Exercised for common shares(3,979)$27.24 (10,871)$33.16 
Surrendered for cash settlement
(757)$29.34 (1,003)$34.52 
Forfeited
(6,286)$39.65 (3,479)$37.65 
Outstanding – end of year
48,656 $37.53 47,646 $38.04 
Exercisable – end of year
17,970 $39.59 17,057 $38.74 
Summary of range of exercise prices of stock options outstanding
The range of exercise prices of stock options outstanding and exercisable at December 31, 2020 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
$20.76
-
$24.993,829 3.86$21.12 944 $21.64 
$25.00
-
$29.991,975 1.81$28.48 1,362 $28.85 
$30.00
-
$34.994,177 4.23$32.37 378 $32.40 
$35.00
-
$39.9922,495 3.44$37.49 4,721 $37.42 
$40.00
-
$44.9912,935 1.53$43.57 8,884 $43.54 
$45.00
-
$46.743,245 2.40$45.21 1,681 $45.18 
 
48,656 2.90$37.53 17,970 $39.59