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Net Income (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2013
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 per share (in thousands, except per share amounts):
 
December 31,
 
2013
 
2012
 
2011
Numerator:
 
 
 
 
 
  Income (loss) from continuing operations
$
21,589

 
$
(16,189
)
 
$
2,018

  Income (loss) from discontinued operations
15,438

 
5,252

 
6,761

  Net income (loss)
$
37,027

 
$
(10,937
)
 
$
8,779

Denominator:
 
 
 
 
 
Weighted average shares outstanding
 
 
 
 
 
  Basic
106,529

 
116,457

 
115,175

  Effect of dilutive securities from stock options, restricted stock units and ESPP
1,279

 
—

 
1,252

  Diluted
107,808

 
116,457

 
116,427

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

 
$
(0.14
)
 
$
0.02

  Discontinued operations
$
0.14

 
$
0.05

 
$
0.06

  Net income (loss)
$
0.35

 
$
(0.09
)
 
$
0.08

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

 
$
(0.14
)
 
$
0.02

  Discontinued operations
$
0.14

 
$
0.05

 
$
0.06

  Net income (loss)
$
0.34

 
$
(0.09
)
 
$
0.08