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Net Income Per Common Share (Tables)
 9 Months Ended
Sep. 30, 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:

 
Three Months Ended
September 30
 
Nine Months Ended
September 30
 
2015
 
2014
 
2015
 
2014
 
(thousands, except per-share data)
Net income
$
22,007

 
$
32,285

 
$
49,854

 
$
64,268

Weighted average common shares outstanding during the period (for basic calculation)
39,127

 
39,423

 
39,372

 
39,407

Dilutive effect of other potential common shares
113

 
58

 
101

 
52

Weighted average common shares and potential common shares (for diluted calculation)
39,240

 
39,481

 
39,473

 
39,459

 
 
 
 
 
 
 
 
Net income per common share - Basic
$
0.56

 
$
0.82

 
$
1.27

 
$
1.63

Net income per common share - Diluted
$
0.56

 
$
0.82

 
$
1.26

 
$
1.63