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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Earnings Per Share
Basic and diluted net income (loss) per share (EPS) (in thousands, except per share data):
 
 
Years ended December 31,
 
 
2017
 
2016
 
2015
Net income (loss) from continuing operations
 
$
(17,414
)
 
$
(37,773
)
 
$
(83,462
)
Weighted average common shares outstanding used to compute basic EPS
 
37,163

 
36,781

 
36,165

Dilutive effect of stock based awards
 
—

 
—

 
—

Weighted average common shares outstanding used to compute diluted EPS
 
37,163

 
36,781

 
36,165

Basic EPS from continuing operations
 
$
(0.47
)
 
$
(1.02
)
 
$
(2.31
)
Diluted EPS from continuing operations
 
$
(0.47
)
 
$
(1.02
)
 
$
(2.31
)