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Loss Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Loss Per Common Share
Summarized basic and diluted earnings per common share were calculated as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in thousands, except per share data)
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net earnings (loss)
$
12,918

 
$
(12,599
)
 
$
6,828

 
$
(28,171
)
Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding
53,508

 
53,306

 
53,455

 
53,272

Effect of dilutive stock awards(1)
1,404

 
—

 
946

 
—

Weighted-average dilutive shares
54,912

 
53,306

 
54,401

 
53,272

 
 
 
 
 
 
 
 
Basic earnings (loss) per common share
$
0.24

 
$
(0.24
)
 
$
0.13

 
$
(0.53
)
Diluted earnings (loss) per common share
$
0.24

 
$
(0.24
)
 
$
0.13

 
$
(0.53
)
Anti-dilutive securities excluded from diluted loss per common share:
 
 
 
 
 
 
 
Anti-dilutive restricted share units
—

 
635

 
—

 
635

Anti-dilutive performance share units
211

 
784

 
211

 
784

Anti-dilutive stock options
1,417

 
3,103

 
1,672

 
3,103


(1) 
There was no dilutive effect to the loss per common share for the three and nine months ended September 30, 2017 due to the net loss incurred for respective periods.