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Net Income / (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares
The following table sets forth the computation of basic and diluted net income per share for the three and six months ended June 30, 2019 and 2018 (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Net income / (loss)
$
3,299

 
$
(254
)
 
$
10,821

 
$
32,327

Shares used to compute basic net income / (loss) per share
35,232

 
34,913

 
35,174

 
34,849

Dilutive potential common shares
 
 
 
 
 
 
 
Stock options
102

 
—

 
104

 
113

Unvested restricted stock awards
170

 
—

 
221

 
381

Shares used to compute diluted net income / (loss) per share
35,504

 
34,913

 
35,499

 
35,343

Basic net income / (loss) per share
$
0.09

 
$
(0.01
)
 
$
0.31

 
$
0.93

Diluted net income / (loss) per share
$
0.09

 
$
(0.01
)
 
$
0.30

 
$
0.91

 
 
 
 
 
 
 
 
Dilutive securities included in the calculation
1,005

 
—

 
992

 
1,366

Anti-dilutive securities excluded from the calculation
1,206

 
2,370

 
1,171

 
1,000