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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
EPS Calculation [Table Text Block]
In thousands, except per share data
 
2017
 
2016
 
2015
Net income (loss)
 
$
(55,623
)
 
$
58,895

 
$
53,703

Average common shares outstanding - basic
 
28,669

 
27,647

 
27,347

Additional shares for stock-based compensation plans (See Note 6)
 
—

 
132

 
70

Average common shares outstanding - diluted
 
28,669

 
27,779

 
27,417

Earnings (loss) per share of common stock - basic
 
$
(1.94
)
 
$
2.13

 
$
1.96

Earnings (loss) per share of common stock - diluted
 
$
(1.94
)
 
$
2.12

 
$
1.96

Additional information:
 
 
 
 
 
 
Antidilutive shares
 
97

 
5

 
12