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Earnings (Loss) Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Earnings (Loss) Per Common Share
Summarized basic and diluted earnings per common share were calculated as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in thousands, except per share data)
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net (loss) earnings
$
(8,893
)
 
$
9,946

 
$
(15,572
)
 
$
35,007

Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding
53,292

 
53,092

 
53,255

 
53,089

Effect of dilutive stock awards(1)
—

 
289

 
—

 
273

Weighted-average dilutive shares
53,292

 
53,381

 
53,255

 
53,362

 
 
 
 
 
 
 
 
Basic (loss) earnings per common share
$
(0.17
)
 
$
0.19

 
$
(0.29
)
 
$
0.66

Diluted (loss) earnings per common share
$
(0.17
)
 
$
0.19

 
$
(0.29
)
 
$
0.66

Anti-dilutive securities excluded from diluted (loss) earnings per common share:
 
 
 
 
 
 
 
Anti-dilutive restricted share units
1,568

 
876

 
1,568

 
876

Anti-dilutive stock options

3,251

 
2,652

 
3,251

 
2,646


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