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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2015
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):
 
Options Outstanding
 
Number of
Shares Subject to Options
 
Weighted
Average
Exercise
Price Per
Share
Balance at December 31, 2014
1,616

 
$19.34
Options granted
50

 
$38.34
Options exercised
(408
)
 
$19.67
Options canceled / forfeited / expired
(67
)
 
$17.34
Balance at June 30, 2015
1,191

 
$20.14
 
 
 
 
Summary of Restricted Stock Awards and Units
Information with respect to outstanding restricted stock awards and units as of June 30, 2015 is as follows (in thousands, except per share amounts):
 
Restricted Stock and Restricted Stock Units
 
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, 2014
502

 
633

 
1,135

 
$
20.30

Awards and units granted
398

 
74

 
472

 
$
40.77

Awards and units vested / earned
(158
)
 
(144
)
 
(302
)
 
$
20.44

Awards and units canceled / forfeited
(27
)
 
(60
)
 
(87
)
 
$
19.11

Balance at June 30, 2015
715

 
503

 
1,218

 
$
28.27