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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Summary of Stock Option Activity and Related Information
A summary of the Company’s stock option activity and related information for the years ended December 31, 2017, 2016, and 2015, are as follows:
 
December 31, 2017
 
December 31, 2016
 
December 31, 2015
 
Options
(000’s)
#
 
Weighted-Average
Exercise Price
$
 
Options
(000’s)
#
 
Weighted-Average
Exercise Price
$
 
Options
(000’s)
#
 
Weighted-Average
Exercise Price
$
Outstanding - beginning of year
3,367

 
29.16

 
2,800

 
36.84

 
2,710

 
36.61

Granted
732

 
10.18

 
916

 
9.44

 
265

 
43.99

Exercised
(3
)
 
9.44

 
—

 
—

 
(36
)
 
33.79

Forfeited / expired
(496
)
 
46.27

 
(349
)
 
38.97

 
(139
)
 
46.80

Outstanding - end of year
3,600

 
22.96

 
3,367

 
29.16

 
2,800

 
36.84

Exercisable - end of year
2,221

 
29.76

 
2,271

 
35.89

 
2,500

 
36.03
Non-Vested Stock Option Activity and Related Information
A summary of the Company’s non-vested stock option activity and related information for the years ended December 31, 2017, 2016 and 2015, are as follows:
 
December 31, 2017
 
December 31, 2016
 
December 31, 2015
 
Options
(000’s)
#
 
Weighted-Average
Grant Date Fair Value
$
 
Options
(000’s)
#
 
Weighted-Average
Grant Date Fair Value
$
 
Options
(000’s)
#
 
Weighted-Average
Grant Date Fair Value
$
Outstanding non-vested stock options - beginning of year
1,096

 
4.30

 
300

 
8.09

 
202

 
9.37

Granted
732

 
4.71

 
916

 
3.60

 
265

 
7.74

Vested
(399
)
 
4.62

 
(118
)
 
8.48

 
(167
)
 
9.07

Forfeited
(50
)
 
3.94

 
(2
)
 
3.60

 
—

 
—

Outstanding non-vested stock options - end of year
1,379

 
4.44

 
1,096

 
4.30

 
300

 
8.09
Details Regarding Outstanding and Exercisable Stock Options
Further details regarding the Company’s outstanding and exercisable stock options at December 31, 2017 are as follows:
 
Outstanding Options
 
Exercisable Options
Range of Exercise Prices
Options
(000’s)
#
 
Weighted- Average
Remaining Life
(Years)
 
Weighted-
Average Exercise Price
$
 
Options
(000’s)
#
 
Weighted- Average
Remaining Life
(Years)
 
Weighted-
Average Exercise Price
$
$5.00 – $9.99
869

 
8.2
 
9.44

 
299

 
8.2
 
9.44

$10.00 – $19.99
910

 
7.5
 
10.52

 
188

 
1.2
 
11.84

$20.00 – $24.99
287

 
2.2
 
24.42

 
287

 
2.2
 
24.42

$25.00 – $29.99
364

 
4.2
 
27.69

 
364

 
4.2
 
27.69

$30.00 – $34.99
113

 
4.4
 
34.42

 
113

 
4.4
 
34.42

$35.00 – $39.99
25

 
0.6
 
39.99

 
25

 
0.6
 
39.99

$40.00 – $49.99
1,017

 
2.0
 
41.34

 
930

 
1.5
 
41.09

$50.00 – $59.99
15

 
6.2
 
56.76

 
15

 
6.2
 
56.76

 
3,600

 
5.2
 
22.96

 
2,221

 
3.1
 
29.76