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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Summary of Numerator and Denominators Used in Computation of Earnings Per Share
A summary of the numerator and denominators used in the computation of earnings per share follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net income (loss) attributable to common stockholders
$
12,080

 
$
7,537

 
$
(41,820
)
 
$
5,125

Denominators:
 
 
 
 
 
 
 
Number of shares outstanding, end of period:
 
 
 
 
 
 
 
Class A common stock
41,055

 
40,500

 
41,055

 
40,500

Class B common stock
988

 
988

 
988

 
988

Unvested restricted stock
(82
)
 
(109
)
 
(82
)
 
(109
)
Effect of weighted average shares outstanding
(10
)
 
(2
)
 
(178
)
 
(210
)
Basic weighted average common shares outstanding
41,951

 
41,377

 
41,783

 
41,169

Impact of potentially dilutive securities:
 
 
 
 
 
 
 
Dilutive effect of stock options and other stock awards
1,344

 
910

 
—

 
727

Diluted weighted average common shares outstanding
43,295

 
42,287

 
41,783

 
41,896

Anti-dilutive potentially issuable shares
—

 
322

 
2,560

 
322