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Net Income (Loss) Per Share
12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Net Loss Per Share
Net Income (Loss) Per Share
The calculations of net income (loss) per share were: 
 
Year Ended December 31,
 
2019
 
2018
 
 
(In thousands, except per share data)
Basic:
 
 
 
 
Net income (loss)
$
54,561

 
$
(15,629
)
 
Weighted average common shares outstanding
20,636

 
20,544

 
Net income (loss) per share
$
2.64

 
$
(0.76
)
 
Diluted:
 
 
 
 
Net income (loss)
$
54,561

 
$
(15,629
)
 
Weighted average common shares outstanding
20,636

 
20,544

 
Net income (loss) per share
$
2.64

 
$
(0.76
)
 

Basic and diluted average common shares outstanding for purposes of computing net income (loss) per share includes outstanding common shares and vested deferred stock units (DSUs).
If an equity method company has dilutive stock options, unvested restricted stock, DSUs, or warrants, diluted net income (loss) per share is computed by first deducting from net income (loss) the income attributable to the potential exercise of the dilutive securities of the company from net income (loss). Any impact is shown as an adjustment to net income (loss) for purposes of calculating diluted net income (loss) per share.
Diluted income (loss) per share for the years ended December 31, 2019 and 2018 do not reflect the following potential shares of common stock that would have an anti-dilutive effect or have unsatisfied performance or market conditions:

At December 31, 2019 and 2018, options to purchase 0.2 million and 0.4 million shares of common stock, respectively, at prices ranging from $10.37 to $18.45 per share, and $9.83 to $19.95 per share per share, respectively, were excluded from the calculation.

At December 31, 2019 and 2018, unvested restricted stock, performance-based stock units and DSUs convertible into 0.3 million and 0.8 million shares of stock, respectively, were excluded from the calculations.

For the year ended December 31, 2018, 0.8 million shares of common stock, respectively, representing the effect of assumed conversion of the 2018 Debentures were excluded from the calculations.