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Net Income (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations
The following table presents the calculation of basic and diluted net income (loss) per share (in thousands, except per share amounts):
 
December 31,
 
2014
 
2013
 
2012
Numerator:
 
 
 
 
 
  Income (loss) from continuing operations
$
(46,248
)
 
$
21,589

 
$
(16,189
)
  Income from discontinued operations
—

 
15,438

 
5,252

  Net income (loss)
$
(46,248
)
 
$
37,027

 
$
(10,937
)
Denominator:
 
 
 
 
 
Weighted average shares outstanding:
 
 
 
 
 
  Basic
92,508

 
106,529

 
116,457

  Effect of dilutive securities from stock options, restricted stock units and ESPP
—

 
1,279

 
—

  Diluted
92,508

 
107,808

 
116,457

Basic net income (loss) per share from:
 
 
 
 
 
  Continuing operations
$
(0.50
)
 
$
0.20

 
$
(0.14
)
  Discontinued operations
$
—

 
$
0.14

 
$
0.05

  Net income (loss)
$
(0.50
)
 
$
0.35

 
$
(0.09
)
Diluted net income (loss) per share from:
 
 
 
 
 
  Continuing operations
$
(0.50
)
 
$
0.20

 
$
(0.14
)
  Discontinued operations
$
—

 
$
0.14

 
$
0.05

  Net income (loss)
$
(0.50
)
 
$
0.34

 
$
(0.09
)