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Equity Award Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock options activity
A summary of stock option activity under the Plans for the years ended December 31, 2010, 2011 and 2012 is as follows (in thousands, except weighted average exercise price):

 
Options Outstanding
 
 
 
 
 
Number
of
Options
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Contractual
Term (Years)
 
Aggregate
Intrinsic
Value
Balances, January 1, 2010
5,918

 
$
7.89

 
7.26
 
$
18,790

Granted
1,629

 
13.39

 
 
 
 
Forfeited, canceled or expired
(636
)
 
10.73

 
 
 
 
Exercised
(664
)
 
4.04

 
 
 
 
Balances, December 31, 2010
6,247

 
$
9.44

 
7.23
 
$
28,424

Options vested and expected to vest at December 31, 2010
5,957

 
$
9.27

 
7.12
 
$
28,141

Options exercisable at December 31, 2010
3,348

 
$
6.82

 
5.67
 
$
24,007

Granted
527

 
$
15.08

 
 
 
 
Forfeited, canceled or expired
(1,006
)
 
12.53

 
 
 
 
Exercised
(1,084
)
 
3.22

 
 
 
 
Balances, December 31, 2011
4,684

 
$
10.85

 
5.32
 
$
4,318

Options vested and expected to vest at December 31, 2011
4,524

 
$
10.73

 
5.19
 
4,318

Options exercisable at December 31, 2011
3,328

 
$
9.83

 
3.95
 
4,317

Granted
1,992

 
$
8.72

 
 
 
 

Forfeited, canceled or expired
(2,534
)
 
12.06

 
 
 
 

Exercised
(487
)
 
3.51

 
 
 
 

Balances, December 31, 2012
3,655

 
$
9.82

 
7.53
 
$
3,059

Options vested and expected to vest at December 31, 2012
3,184

 
$
9.95

 
7.26
 
$
2,862

Options exercisable at December 31, 2012
1,752

 
$
10.44

 
5.81
 
$
2,257
Summary of information regarding stock options outstanding
The following table summarizes information about stock options outstanding as of December 31, 2012 (in thousands, except weighted average exercise price):

 
Options Outstanding
 
Options Vested
Exercise Price
Number
Outstanding
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Weighted
Average
Exercise
Price
 
Number
Exercisable
 
Weighted
Average
Exercise
Price
$0.20-$5.50
356

 
2.61
 
$
2.88

 
355

 
$
2.88

$5.50-$10.17
2,195

 
8.76
 
$
8.71

 
511

 
$
9.36

$10.17-$12.11
144

 
5.03
 
$
11.73

 
122

 
$
11.90

$12.11-$13.26
336

 
5.06
 
$
13.25

 
336

 
$
13.25

$13.26-$13.99
411

 
7.52
 
$
13.53

 
290

 
$
13.46

$13.99-$22.97
213

 
8.34
 
$
19.10

 
138

 
$
19.43

 
3,655

 
7.51
 
$
9.82

 
1,752

 
$
10.44
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes all RSU activity for the years ended December 31, 2010, 2011 and 2012 (in thousands except weighted average grant date fair value):

 
Number of
RSUs
Outstanding
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value
Balances at January 1, 2010
49

 
2.49
 
$
506

Awarded
149

 
 
 
 
Forfeited or canceled
(30
)
 
 
 
 
Balances at December 31, 2010
168

 
2.67
 
$
2,346

RSUs vested and expected to vest at December 31, 2010
119

 
2.65
 
$
1,663

Awarded
20

 
 
 
 
Released
(17
)
 
 
 
 
Forfeited or canceled
(34
)
 
 
 
 
Balances at December 31, 2011
136

 
1.74
 
$
1,072

RSUs vested and expected to vest at December 31, 2011
122

 
1.70
 
798

Awarded
441

 
 
 
 

Released
(45
)
 
 
 
 

Forfeited or cancelled
(110
)
 
 
 
 

Balances, December 31, 2012
422

 
2.29
 
$
3,716

RSUs vested and expected to vest at December 31, 2012
288

 
1.99
 
$
2,544