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Net Income Per Common Share (Tables)
9 Months Ended
Sep. 30, 2018
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
 
2018
 
2017
 
2018
 
2017
 
(thousands, except per-share data)
Net income
$
13,848

 
$
31,661

 
$
92,723

 
$
63,835

Weighted average common shares outstanding during the period (for basic calculation)
38,998

 
38,660

 
38,920

 
38,601

Dilutive effect of other potential common shares
463

 
479

 
477

 
361

Weighted average common shares and potential common shares (for diluted calculation)
39,461

 
39,139

 
39,397

 
38,962

 
 
 
 
 
 
 
 
Net income per common share - Basic
$
0.36

 
$
0.82

 
$
2.38

 
$
1.65

Net income per common share - Diluted
$
0.35

 
$
0.81

 
$
2.35

 
$
1.64