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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
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,
 
 
2014
 
2013
 
2012
Net income (loss)
 
$
(71,815
)
 
$
(58,990
)
 
$
44,841

Weighted average common shares outstanding used to compute basic EPS
 
35,947

 
35,553

 
34,873

Dilutive effect of stock based awards
 
—

 
—

 
249

Weighted average common shares outstanding used to compute diluted EPS
 
35,947

 
35,553

 
35,122

Basic EPS
 
$
(2.00
)
 
$
(1.66
)
 
$
1.29

Diluted EPS
 
$
(2.00
)
 
$
(1.66
)
 
$
1.28