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Net Income Per Common Share (Tables)
 6 Months Ended
Jun. 30, 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
June 30
 
Six Months Ended
June 30
 
2015
 
2014
 
2015
 
2014
 
(thousands, except per-share data)
Net income
$
20,230

 
$
26,418

 
$
27,847

 
$
31,983

Weighted average common shares outstanding during the period (for basic calculation)
39,494

 
39,420

 
39,496

 
39,399

Dilutive effect of other potential common shares
106

 
43

 
108

 
59

Weighted average common shares and potential common shares (for diluted calculation)
39,600

 
39,463

 
39,604

 
39,458

 
 
 
 
 
 
 
 
Net income per common share - Basic
$
0.51

 
$
0.67

 
$
0.71

 
$
0.81

Net income per common share - Diluted
$
0.51

 
$
0.67

 
$
0.70

 
$
0.81