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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 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:

 
 
Year ended December 31,
 
 
2013
 
2012
 
2011
 
 
(in thousands)
Net income
 
$
32,032

 
$
40,402

 
$
30,470

Less distributed and undistributed earnings allocated to participating securities
 
(916
)
 
(1,224
)
 
(908
)
Net income allocated to common shares
 
$
31,116

 
$
39,178

 
$
29,562

 
 
 
 
 
 
 
Weighted average common shares outstanding
 
24,850

 
25,007

 
25,405

Incremental shares from assumed conversions of common stock options
 
22

 
60

 
92

Adjusted weighted average common shares outstanding
 
24,872

 
25,067

 
25,497

 
 
 
 
 
 
 
Potentially dilutive securities not included in weighted average share
calculation due to anti-dilutive effect
 
8

 
29

 
29