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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Diluted earnings (loss) per share are calculated as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
In thousands, except per share data
 
2017
 
2016
 
2017
 
2016
Net income (loss)
 
$
(8,495
)
 
$
(8,040
)
 
$
34,544

 
$
30,620

Average common shares outstanding - basic
 
28,678

 
27,554

 
28,653

 
27,504

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

 
—

 
81

 
125

Average common shares outstanding - diluted
 
28,678

 
27,554

 
28,734

 
27,629

Earnings (loss) per share of common stock - basic
 
$
(0.30
)
 
$
(0.29
)
 
$
1.21

 
$
1.11

Earnings (loss) per share of common stock - diluted
 
$
(0.30
)
 
$
(0.29
)
 
$
1.20


$
1.11

Additional information:
 
 
 
 
 
 
 
 
Antidilutive shares
 
96

 
159

 
15

 
5