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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share
 
The computation of basic and diluted earnings (loss) per common share for the years ended December 31, 2017, 2016 and 2015, is as follows (in thousands, except per share amounts):
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(as restated)
 
(as restated)
 
(as revised)
Numerator:
 
 
 
 
 
Net income (loss)
$
16,430

 
$
3,949

 
$
(32,389
)
 
 
 
 
 
 
Denominator:
 

 
 

 
 

Denominator for basic earnings (loss) per share—weighted-average shares outstanding
53,851

 
53,607

 
52,791

Effect of dilutive securities:


 


 
 

Employee stock options and restricted common shares
1,093

 
728

 
—

Contingently issuable shares
—

 
125

 
—

Denominator for diluted earnings (loss) per share
54,944

 
54,460

 
52,791

 
 
 
 
 
 
Basic earnings (loss) per share
$
0.31

 
$
0.07

 
$
(0.61
)
Diluted earnings (loss) per share
$
0.30

 
$
0.07

 
$
(0.61
)