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Net Income (Loss) Per Share
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Net Loss Per Share
Net Loss Per Share
The calculations of net loss per share were: 
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands, except per share data)
Basic:
 
 
 
 
 
Net loss
$
(88,572
)
 
$
(22,262
)
 
$
(59,524
)
Weighted average common shares outstanding
20,430

 
20,343

 
20,874

Net loss per share
$
(4.34
)
 
$
(1.09
)
 
$
(2.85
)
Diluted:
 
 
 
 
 
Net loss
$
(88,572
)
 
$
(22,262
)
 
$
(59,524
)
Weighted average common shares outstanding
20,430

 
20,343

 
20,874

Net loss per share
$
(4.34
)
 
$
(1.09
)
 
$
(2.85
)

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 a consolidated or equity method partner 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 partner 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 loss per share for the years ended December 31, 2017, 2016 and 2015 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, 2017, 2016 and 2015, options to purchase 0.6 million, 0.7 million and 1.1 million shares of common stock, respectively, at prices ranging from $9.83 to $19.95 per share, $9.83 to $19.95 per share and $7.14 to $19.95 per share per share, respectively, were excluded from the calculation.

•
At December 31, 2017, 2016 and 2015 unvested restricted stock, performance-based stock units and DSUs convertible into 1.0 million, 0.9 million and 0.7 million shares of stock, respectively, were excluded from the calculations.

•
For the years ended December 31, 2017, 2016, and 2015, 2.3 million, 3.0 million and 3.0 million shares of common stock, respectively, representing the effect of assumed conversion of the 2018 Debentures were excluded from the calculations.