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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Earnings Per Share
Basic and diluted earnings per common share were calculated as follows (in thousands, except per share data):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net earnings (loss)
$
6,181

 
$
(4,092
)
 
$
41,188

 
$
46,353

Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding
53,155

 
53,060

 
53,111

 
53,044

Effect of dilutive stock awards
299

 
273

 
281

 
313

Weighted-average dilutive shares
53,454

 
53,333

 
53,392

 
53,357

 
 
 
 
 
 
 
 
Basic earnings (loss) per share
$
0.12

 
$
(0.08
)
 
$
0.78

 
$
0.87

Diluted earnings (loss) per share
$
0.12

 
$
(0.08
)
 
$
0.77

 
$
0.87