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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Diluted earnings (loss) from continuing operations per share are calculated as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
In thousands, except per share data
 
2018
 
2017
 
2018
 
2017
Net income (loss) from continuing operations
 
$
(11,144
)
 
$
(7,887
)
 
$
30,528

 
$
37,585

Average common shares outstanding - basic
 
28,815

 
28,678

 
28,787

 
28,653

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

 
—

 
59

 
81

Average common shares outstanding - diluted
 
28,815

 
28,678

 
28,846

 
28,734

Earnings (loss) from continuing operations per share of common stock - basic
 
$
(0.39
)
 
$
(0.28
)
 
$
1.06

 
$
1.32

Earnings (loss) from continuing operations per share of common stock - diluted
 
$
(0.39
)
 
$
(0.28
)
 
$
1.06

 
$
1.31

Additional information:
 
 
 
 
 
 
 
 
Antidilutive shares
 
73

 
96

 
4

 
15