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Net Income Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2015
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
 
2015
 
2014
 
2013
 
(thousands, except per-share data)
Net income
$
52,182

 
$
80,009

 
$
116,936

Weighted average common shares outstanding during the period (for basic calculation)
39,239

 
39,412

 
40,203

Dilutive effect of other potential common shares
116

 
80

 
23

Weighted average common shares and potential common shares (for diluted calculation)
39,355

 
39,492

 
40,226

 
 
 
 
 
 
Net income per common share - Basic
$
1.33

 
$
2.03

 
$
2.91

Net income per common share - Diluted
$
1.33

 
$
2.03

 
$
2.91