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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Earnings Per Share
Basic and diluted earnings (loss) per common share were calculated as follows (in thousands, except per share data):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Numerator:
 
 
 
 
 
 
 
Net earnings (loss)
$
(4,092
)
 
$
25,925

 
$
46,353

 
$
70,872

Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding
53,060

 
52,864

 
53,044

 
52,828

Effect of dilutive stock awards
273

 
250

 
313

 
241

Weighted-average dilutive shares
53,333

 
53,114

 
53,357

 
53,069

 
 
 
 
 
 
 
 
Basic earnings (loss) per share
$
(0.08
)
 
$
0.49

 
$
0.87

 
$
1.34

Diluted earnings (loss) per share
$
(0.08
)
 
$
0.49

 
$
0.87

 
$
1.34