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Shareholders' Equity
 9 Months Ended
Sep. 30, 2012
Stockholders' Equity Note [Abstract]  
Shareholders' Equity
Shareholders’ Equity

The following table summarizes the change in shareholders’ equity during the three and nine months ended September 30, 2012 and 2011, respectively:

 
Three months ended September 30,
 
Nine months ended September 30,
 
2012
 
2011
 
2012
 
2011
Balance at the beginning of the period
$
40,792

 
$
34,668

 
$
39,664

 
$
31,735

Net income during the period
929

 
3,375

 
1,957

 
5,508

Treasury stock purchased
(292
)
 
—

 
(384
)
 
—

Stock-based compensation
65

 
48

 
176

 
131

Exercise of stock options
220

 
14

 
301

 
731

Balance at end of the period
$
41,714

 
$
38,105

 
$
41,714

 
$
38,105