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Net Income Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2016
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
 
2016
 
2015
 
2016
 
2015
 
(thousands, except per-share data)
Net income
$
19,228

 
$
20,230

 
$
24,178

 
$
27,847

Weighted average common shares outstanding during the period (for basic calculation)
38,814

 
39,494

 
38,834

 
39,496

Dilutive effect of other potential common shares
158

 
106

 
16

 
108

Weighted average common shares and potential common shares (for diluted calculation)
38,972

 
39,600

 
38,850

 
39,604

 
 
 
 
 
 
 
 
Net income per common share - Basic
$
0.50

 
$
0.51

 
$
0.62

 
$
0.71

Net income per common share - Diluted
$
0.49

 
$
0.51

 
$
0.62

 
$
0.70