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Net Income per Share (Tables)
 9 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Summary of the net income allocated to common shares and the basic and diluted shares used in the net income per share computations
The following table summarizes the net income allocated to common shares and the basic and diluted shares used in the net income per share computations:

 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
 
2013
 
2012
 
2013
 
2012
 
 
(in thousands)
 
 
 
 
 
 
 
 
 
Net income
 
$
10,082

 
$
11,452

 
$
26,743

 
$
30,957

Less distributed and undistributed earnings allocated to participating securities
 
(289
)
 
(334
)
 
(769
)
 
(898
)
Net income allocated to common shares
 
$
9,793

 
$
11,118

 
$
25,974

 
$
30,059

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
24,849

 
24,923

 
24,855

 
25,034

Incremental shares from assumed conversions of common stock options
 
18

 
57

 
24

 
63

Adjusted weighted average common shares outstanding
 
24,867

 
24,980

 
24,879

 
25,097

 
 
 
 
 
 
 
 
 
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect
 
—

 
41

 
10

 
33