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Net Income Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Net Income Per Common Share [Table Text Block]
The following table sets forth the computation of basic and diluted net income per common share:

 
Three Months Ended
March 31
 
2015
 
2014
 
(thousands, except per-share data)
Net income
$
7,617

 
$
5,565

Weighted average common shares outstanding during the period (for basic calculation)
39,498

 
39,372

Dilutive effect of other potential common shares
124

 
80

Weighted average common shares and potential common shares (for diluted calculation)
39,622

 
39,452

 
 
 
 
Net income per common share - Basic
$
0.19

 
$
0.14

Net income per common share - Diluted
$
0.19

 
$
0.14