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Shares (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Schedule of common shares issued and outstanding
Issued and outstanding:
 
 
Voting common shares

 
Treasury shares

 
Common shares outstanding, net of treasury shares

Issued and outstanding at December 31, 2012
 
36,251,006

 
—

 
36,251,006

Issued upon exercise of stock options
 
295,230

 
—

 
295,230

Retired through Share Purchase Program
 
(1,800,000
)
 
—

 
(1,800,000
)
Issued and outstanding at December 31, 2013
 
34,746,236

 
—

 
34,746,236

Issued upon exercise of stock options
 
385,880

 
—

 
385,880

Issued upon exercise of senior executive stock options
 
291,800

 
—

 
291,800

Purchase of treasury shares for settlement of certain equity classified stock-based compensation (note 22(d(ii)), 22(e) and 22(f(ii)))
 
—

 
(589,892
)
 
(589,892
)
Retired through Share Purchase Program (note 17(c))
 
(500,000
)
 
—

 
(500,000
)
Issued and outstanding at December 31, 2014
 
34,923,916

 
(589,892
)
 
34,334,024

Issued upon exercise of stock options
 
30,080

 
—

 
30,080

Purchase of treasury shares for settlement of certain equity classified stock-based compensation (note 22(d(ii)), 22(e) and 22(f(ii)))
 
—

 
(687,314
)
 
(687,314
)
Settlement of certain equity classified stock-based compensation
 
—

 
20,403

 
20,403

Retired through Share Purchase Programs (note 17(c))
 
(1,803,715
)
 
—

 
(1,803,715
)
Issued and outstanding at December 31, 2015
 
33,150,281

 
(1,256,803
)
 
31,893,478
Schedule of net (loss) income per share
Net (loss) income per share
Year ended December 31,
 
2015

 
2014

 
2013

Net loss from continuing operations
 
$
(7,470
)
 
$
(697
)
 
$
(18,047
)
Net loss (income) from discontinued operations
 
—

 
(472
)
 
87,231

Net (loss) income
 
$
(7,470
)
 
$
(1,169
)
 
$
69,184

 
 
 
 
 
 
 
Weighted average number of basic common shares
 
32,758,088

 
35,014,418

 
36,269,996

Dilutive effect of stock options and treasury shares
 
—

 
—

 
342,957

Weighted average number of diluted common shares
 
32,758,088

 
35,014,418

 
36,612,953

 
 
 
 
 
 
 
Basic per share information
 
 
 
 
 
 
Net loss from continuing operations
 
$
(0.23
)
 
$
(0.02
)
 
$
(0.50
)
Net loss (income) from discontinued operations
 
—

 
(0.01
)
 
2.41

Net (loss) income
 
$
(0.23
)
 
$
(0.03
)
 
$
1.91

 
 
 
 
 
 
 
Diluted per share information
 
 
 
 
 
 
Net loss from continuing operations
 
$
(0.23
)
 
$
(0.02
)
 
$
(0.50
)
Net loss (income) from discontinued operations
 
—

 
(0.01
)
 
2.39

Net (loss) income
 
$
(0.23
)
 
$
(0.03
)
 
$
1.89