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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
22,302

 
$
12,080

 
$
20,096

 
$
(41,820
)
Denominators:
 
 
 
 
 
 
 
Number of shares outstanding, end of period:
 
 
 
 
 
 
 
Class A common stock
41,932

 
41,055

 
41,932

 
41,055

Class B common stock
988

 
988

 
988

 
988

Unvested restricted stock
(32
)
 
(82
)
 
(32
)
 
(82
)
Effect of weighted average shares outstanding
(109
)
 
(10
)
 
(283
)
 
(178
)
Basic weighted average common shares outstanding
42,779

 
41,951

 
42,605

 
41,783

Impact of potentially dilutive securities:
 
 
 
 
 
 
 
Dilutive effect of stock options and other stock awards
1,396

 
1,344

 
1,333

 
—

Diluted weighted average common shares outstanding
44,175

 
43,295

 
43,938

 
41,783

Anti-dilutive potentially issuable shares
—

 
—

 
2

 
2,560