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Net Income Per Common Share (Tables)
 9 Months Ended
Sep. 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
September 30
 
Nine Months Ended
September 30
 
2017
 
2016
 
2017
 
2016
 
(thousands, except per-share data)
Net income
$
31,661

 
$
9,981

 
$
63,835

 
$
34,159

Weighted average common shares outstanding during the period (for basic calculation)
38,660

 
38,814

 
38,601

 
38,827

Dilutive effect of other potential common shares
479

 
306

 
361

 
123

Weighted average common shares and potential common shares (for diluted calculation)
39,139

 
39,120

 
38,962

 
38,950

 
 
 
 
 
 
 
 
Net income per common share - Basic
$
0.82

 
$
0.26

 
$
1.65

 
$
0.88

Net income per common share - Diluted
$
0.81

 
$
0.26

 
$
1.64

 
$
0.88