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Shareholders' Equity
 6 Months Ended
Jun. 30, 2013
Stockholders' Equity Note [Abstract]  
Shareholders' Equity
Shareholders’ Equity

The following table summarizes the change in shareholders’ equity during the three and six months ended June 30, 2013 and 2012, respectively:

 
Three months ended June 30,
 
Six months ended June 30,
 
2013
 
2012
 
2013
 
2012
Balance at the beginning of the period
$
66,960

 
$
40,193

 
$
66,668

 
$
39,664

Net income during the period
1,045

 
650

 
1,775

 
1,128

Treasury stock purchased
(418
)
 
(92
)
 
(991
)
 
(92
)
Stock-based compensation
67

 
60

 
126

 
111

Exercise of stock options
88

 
81

 
164

 
81

Unrealized gain or loss in investments
(87
)
 
—

 
(87
)
 
—

Balance at end of the period
$
67,655

 
$
40,892

 
$
67,655

 
$
40,892