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Net Income Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2014
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
 
2014
 
2013
 
2014
 
2013
 
(thousands, except per-share data)
Net income
$
32,285

 
$
15,860

 
$
64,268

 
$
107,108

Weighted average common shares outstanding during the period (for basic calculation)
39,423

 
40,625

 
39,407

 
40,486

Dilutive effect of other potential common shares
58

 
15

 
52

 
6

Weighted average common shares and potential common shares (for diluted calculation)
39,481

 
40,640

 
39,459

 
40,492

 
 
 
 
 
 
 
 
Net income per common share - Basic
$
0.82

 
$
0.39

 
$
1.63

 
$
2.65

Net income per common share - Diluted
$
0.82

 
$
0.39

 
$
1.63

 
$
2.65