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Net Income Per Common Share (Tables)
12 Months Ended
Dec. 31, 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:

 
Year Ended December 31
 
2018
 
2017
 
2016
 
(thousands, except per-share data)
Net income
$
20,477

 
$
82,957

 
$
38,254

Weighted average common shares outstanding during the period (for basic calculation)
38,932

 
38,623

 
38,761

Dilutive effect of other potential common shares
455

 
451

 
164

Weighted average common shares and potential common shares (for diluted calculation)
39,387

 
39,074

 
38,925

 
 
 
 
 
 
Net income per common share - Basic
$
0.53

 
$
2.15

 
$
0.99

Net income per common share - Diluted
$
0.52

 
$
2.12

 
$
0.98