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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Earnings Per Share
 
Basic (loss) earnings per common share is calculated by dividing net (loss) income by the weighted average number of common shares outstanding for the period. Diluted (loss) earnings per share is calculated by dividing net (loss) income by the weighted average shares outstanding assuming dilution. Dilutive common shares outstanding is computed using the Treasury Stock Method and reflects the additional shares that would be outstanding if dilutive stock options were exercised and restricted stock and restricted stock units were settled for common shares during the period. In addition, dilutive shares include any shares issuable related to PSUs for which the performance conditions have been met as of the end of the period. There were no dilutive effects during the three months ended March 31, 2018 as a result of the net loss. During the three months ended March 31, 2017, 2.7 million options and restricted common shares were excluded from the calculation as these options and restricted common shares were anti-dilutive. The computations of basic and diluted (loss) earnings per common share for the three months ended March 31, 2018 and 2017 are as follows (in thousands, except per share amounts): 
 
Three Months Ended March 31,
 
2018
 
2017
 
 
 
(as restated)
Numerator:
 
 
 
Net (loss) income
$
(1,684
)
 
$
5,678

 
 
 
 
Denominator:
 
 
 
Weighted-average shares outstanding – basic
53,716

 
54,056

Effect of dilutive securities:
 
 
 
Employee and director stock options and restricted common shares
—

 
548

Contingently issuable shares
—

 
125

Weighted-average shares outstanding – diluted
53,716

 
54,729

 
 
 
 
Basic (loss) earnings per share
$
(0.03
)
 
$
0.11

Diluted (loss) earnings per share
$
(0.03
)
 
$
0.10