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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity
A summary of the stock option activity is presented below (in thousands, except per share amounts):
 
 
Shares Outstanding
 
Number of
Shares
 
Weighted
Average
Exercise
Price Per
Share
Balance at December 31, 2012
7,099

 
$
17.80

Options granted
350

 
$
17.89

Options exercised
(1,180
)
 
$
16.30

Options canceled / forfeited / expired
(1,083
)
 
$
15.93

Balance at June 30, 2013
5,186

 
$
18.54
Summary of Restricted Stock Awards and Units
Information with respect to outstanding restricted stock awards and units as of June 30, 2013 is as follows (in thousands, except per share amounts):
 
 
Restricted Stock
 
Number of Shares
Subject to Time-
based Vesting
 
Number of Shares
Subject to
Performance-
based Vesting
 
Total Number
of Shares
 
Weighted Average
Grant Date Fair
Value Per Share
Balance at December 31, 2012
715

 
116

 
831

 
$
16.36

Awards and units granted
237

 
108

 
345

 
$
18.84

Awards and units vested / earned
(94
)
 
(27
)
 
(121
)
 
$
17.97

Awards and units canceled / forfeited
(145
)
 
(82
)
 
(227
)
 
$
17.40

Balance at June 30, 2013
713

 
115

 
828

 
$
16.87