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NET INCOME (LOSS) PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Calculations of net income (loss) per share
The table below shows the calculations for years ended December 31, 2017, 2016 and 2015.
(In thousands, except for per share data)
2017
 
2016
 
2015
Numerator (both basic and diluted)
 
 
 
 
 
Net income (loss) relevant to common stockholders
$
12,613

 
$
(53,147
)
 
$
(45,853
)
Denominator
 
 
 
 
 
Denominator for basic income (loss) per share
76,371

 
44,787

 
34,993

Dilutive effect of stock options
2,903

 
—

 
—

Dilutive effect of performance stock units
59

 
—

 
—

Dilutive effect of non-vested restricted stock units
250

 
—

 
—

Denominator for diluted income (loss) per share
79,583

 
44,787

 
34,993

Basic net income (loss) per common share
$
0.17

 
$
(1.19
)
 
$
(1.31
)
Diluted net income (loss) per common share
$
0.16

 
$
(1.19
)
 
$
(1.31
)
Anti-dilutive shares excluded from diluted earnings (loss) per share calculation
As shown in the table below, the following non-vested restricted stock units, preferred stock, performance stock units, and stock options have not been included in the calculation of diluted income (loss) per share for years ended December 31, 2017, 2016 and 2015 as they would be anti-dilutive to the calculation above.
(Count in thousands)
2017
 
2016
 
2015
Stock options
—

 
4,646

 
3,486

Preferred stock
—

 
17,000

 
—

Performance stock units
—

 
—

 
—

Non-vested restricted stock units
—

 
372

 
372

 
—

 
22,018

 
3,858