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Net Income Per Common Share (Tables)
 6 Months Ended
Jun. 30, 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
June 30
 
Six Months Ended
June 30
 
2017
 
2016
 
2017
 
2016
 
(thousands, except per-share data)
Net income
$
22,154

 
$
19,228

 
$
32,174

 
$
24,178

Weighted average common shares outstanding during the period (for basic calculation)
38,643

 
38,814

 
38,572

 
38,834

Dilutive effect of other potential common shares
359

 
158

 
359

 
16

Weighted average common shares and potential common shares (for diluted calculation)
39,002

 
38,972

 
38,931

 
38,850

 
 
 
 
 
 
 
 
Net income per common share - Basic
$
0.57

 
$
0.50

 
$
0.83

 
$
0.62

Net income per common share - Diluted
$
0.57

 
$
0.49

 
$
0.83

 
$
0.62