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Net Income Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2017
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
 
2017
 
2016
 
(thousands, except per-share data)
Net income
$
10,020

 
$
4,950

Weighted average common shares outstanding during the period (for basic calculation)
38,500

 
38,853

Dilutive effect of other potential common shares
401

 
27

Weighted average common shares and potential common shares (for diluted calculation)
38,901

 
38,880

 
 
 
 
Net income per common share - Basic
$
0.26

 
$
0.13

Net income per common share - Diluted
$
0.26

 
$
0.13