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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
EPS Calculation [Table Text Block]
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
In thousands, except per share data
 
2016
 
2015
 
2016
 
2015
Net income
 
$
2,019

 
$
2,197

 
$
38,660

 
$
30,683

Average common shares outstanding - basic
 
27,510

 
27,343

 
27,479

 
27,322

Additional shares for stock-based compensation plans (See Note 5)
 
122

 
45

 
112

 
56

Average common shares outstanding - diluted
 
27,632

 
27,388

 
27,591

 
27,378

Earnings per share of common stock - basic
 
$
0.07

 
$
0.08

 
$
1.41

 
$
1.12

Earnings per share of common stock - diluted
 
$
0.07

 
$
0.08

 
$
1.40

 
$
1.12

Additional information:
 
 
 
 
 
 
 
 
Antidilutive shares
 
23

 
35

 
16

 
27