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Shares (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of common shares
Issued and outstanding:
 
 
Common shares

 
Treasury shares

 
Common shares outstanding, net of treasury shares

Issued and outstanding at December 31, 2016
 
30,518,907

 
(2,213,247
)
 
28,305,660

Issued upon exercise of stock options
 
176,800

 
—

 
176,800

Purchase of treasury shares for settlement of certain equity classified stock-based compensation
 
—

 
(758,271
)
 
(758,271
)
Settlement of certain equity classified stock-based compensation
 
—

 
353,592

 
353,592

Retired through share purchase program
 
(2,625,557
)
 
—

 
(2,625,557
)
Issued and outstanding at December 31, 2017
 
28,070,150

 
(2,617,926
)
 
25,452,224

Issued upon exercise of stock options
 
297,940

 
—

 
297,940

Issued upon conversion of convertible debentures
 
2,211

 
—

 
2,211

Purchase of treasury shares for settlement of certain equity classified stock-based compensation
 
—

 
(660,620
)
 
(660,620
)
Settlement of certain equity classified stock-based compensation
 
—

 
1,193,935

 
1,193,935

Retired through share purchase program
 
(1,281,485
)
 
—

 
(1,281,485
)
Issued and outstanding at December 31, 2018
 
27,088,816

 
(2,084,611
)
 
25,004,205
Schedule of net income per share
Year ended December 31,
2018

 
2017

Net income available to common shareholders
$
15,286

 
$
5,264

Interest from Convertible Debentures (after tax)
1,792

 
—

Diluted net income available to common shareholders
$
17,078

 
$
5,264

 
 
 
 
Weighted average number of common shares
24,991,517

 
26,697,066

Weighted average effect of dilutive securities
 
 
 
Dilutive effect of treasury shares
2,394,824

 
2,622,957

Dilutive effect of stock options
357,026

 
285,703

Dilutive effect of Convertible Debentures
3,684,424

 
—

Weighted average number of diluted common shares
31,427,791

 
29,605,726

 
 
 
 
Basic net income per share
$
0.61

 
$
0.20

Diluted net income per share
$
0.54

 
$
0.18