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EARNINGS PER SHARE
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
EARNINGS PER SHARE
Basic earnings per share is computed by dividing the net (loss) income from continuing operations attributable to common stockholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated based on the combined weighted average number of common shares and potentially dilutive shares, which include the assumed exercise of employee stock options, including market-based performance stock options based on the expected achievement of performance targets, unvested restricted stock awards, unvested restricted stock units and unvested performance stock units, including market-based performance units based on the expected achievement of performance targets. In computing diluted earnings per share, we utilize the treasury stock method.
A summary of the numerator and denominators used in the computation of earnings per share follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net (loss) income attributable to common stockholders
$
(53,675
)
 
$
5,195

 
$
(53,900
)
 
$
(2,413
)
Denominators:
 
 
 
 
 
 
 
Number of shares outstanding, end of period:
 
 
 
 
 
 
 
Class A common stock
41,042

 
40,500

 
41,042

 
40,500

Class B common stock
988

 
988

 
988

 
988

Unvested restricted stock
(88
)
 
(115
)
 
(88
)
 
(115
)
Effect of weighted average shares outstanding
(131
)
 
(241
)
 
(244
)
 
(309
)
Basic weighted average common shares outstanding
41,811

 
41,132

 
41,698

 
41,064

Impact of potentially dilutive securities:
 
 
 
 
 
 
 
Dilutive effect of stock options and other stock awards
—

 
466

 
—

 
—

Diluted weighted average common shares outstanding
41,811

 
41,598

 
41,698

 
41,064

Anti-dilutive potentially issuable shares
2,586

 
473

 
2,586

 
2,211