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Equity Incentive Plans and Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Shares available for grant under stock-based incentive plans
 
Shares Available for Grant
Shares available as of December 31, 2009
7,462,394
Stock options granted
(1,921,743)
Stock options forfeited
1,411,524
Stock options expired under former plans
(1,231,899)
Nonvested equity stock and stock units granted (1)
(453,468)
Nonvested equity stock and stock units forfeited (1)
81,354
Total shares available for grant as of December 31, 2010
5,348,162
Stock options granted
(2,357,001)
Stock options forfeited
865,097
Stock options expired under former plans
(503,526)
Nonvested equity stock and stock units granted (1)
(562,257)
Nonvested equity stock and stock units forfeited (1)
22,401
Total shares available for grant as of December 31, 2011
2,812,876
    Increase in shares approved for issuance
6,500,000
Stock options granted (2)
(7,789,220)
Stock options forfeited (3)
2,610,812
Stock options expired under former plans
(576,763)
Nonvested equity stock and stock units granted (1)
(1,113,014)
Nonvested equity stock and stock units forfeited (1)
284,468
Total shares available for grant as of December 31, 2012
2,729,159
______________________________________
(1)
For purposes of determining the number of shares available for grant under the 2006 Plan against the maximum number of shares authorized, each restricted stock granted reduces the number of shares available for grant by 1.5 shares and each restricted stock forfeited increases shares available for grant by 1.5 shares.
(2)
Amount includes 2,840,986 shares that were granted from the stock option exchange program (discussed below).
(3)
Amount excludes 6,449,255 shares that were surrendered from the stock option exchange program (discussed below) as the shares are no longer available for grant.
Schedule of stock option activity
 
Options Outstanding
 
Weighted Average Remaining Contractual Term
 
 
 
Number of Shares
 
Weighted Average Exercise Price per Share
 
 
Aggregate Intrinsic Value
 
(Dollars in thousands, except per share amounts)
Outstanding as of December 31, 2009
14,456,110
 
$
20.95

 
 
 
 
Options granted
1,921,743
 
$
22.47

 
 
 
 
Options exercised
(996,946)
 
$
12.95

 
 
 
 
Options forfeited
(1,411,524)
 
$
49.43

 
 
 
 
Outstanding as of December 31, 2010
13,969,383
 
$
18.85

 
 
 
 
Options granted
2,357,001
 
$
18.83

 
 
 
 
Options exercised
(873,691)
 
$
8.46

 
 
 
 
Options forfeited
(865,097)
 
$
14.53

 
 
 
 
Outstanding as of December 31, 2011
14,587,596
 
$
19.73

 
 
 
 
Options granted
7,789,220
 
$
5.81

 
 
 
 
Options exercised
(221,934)
 
$
4.44

 
 
 
 
Options forfeited
(2,610,812)
 
$
10.91

 
 
 
 
Options surrendered in stock option exchange program
(6,449,255)
 
$
21.11

 
 
 
 
Outstanding as of December 31, 2012
13,094,815
 
$
12.79

 
6.0
 
$
755

Vested or expected to vest at December 31, 2012
12,185,462
 
$
13.24

 
5.8
 
$
611

Options exercisable at December 31, 2012
6,129,729
 
$
19.21

 
3.6
 
$
—
Schedule of shares authorized under Stock Option Plans, by exercise price range
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
Number Outstanding
 
Weighted Average Remaining
Contractual Life (in years)
 
Weighted Average Exercise Price
 
Number Exercisable
 
Weighted Average Exercise Price
$4.13 – $5.32
1,318,083
 
9.6
 
$
4.35

 
9,956
 
$
4.87

$5.63 – $5.63
2,119,123
 
6.3
 
$
5.63

 
—

 
$
—

$5.76 – $6.39
1,394,307
 
9.4
 
$
5.81

 
17,934
 
$
6.39

$7.06 – $7.17
135,545
 
8.3
 
$
7.06

 
32,445
 
$
7.06

$7.31 – $7.31
1,370,149
 
8.8
 
$
7.31

 
279,665
 
$
7.31

$7.70 – $13.21
1,330,843
 
5.1
 
$
9.29

 
990,415
 
$
9.39

$13.30 – $18.69
1,885,637
 
3.3
 
$
16.64

 
1,703,140
 
$
16.87

$19.13 – $21.51
1,497,065
 
4.8
 
$
20.19

 
1,248,319
 
$
20.06

$21.95 – $30.05
1,380,063
 
3.8
 
$
23.59

 
1,183,855
 
$
23.70

$32.05 – $40.80
664,000
 
1.8
 
$
36.46

 
664,000
 
$
36.46

$4.13 – $40.80
13,094,815
 
6.0
 
$
12.79

 
6,129,729
 
$
19.21
Weighted-average assumptions for Stock Option Plans
 
Stock Option Plans for Years Ended December 31,
 
2012
 
2011
 
2010
Stock Option Plans
 
 
 
 
 
Expected stock price volatility
57%-68%
 
50%-75%
 
49%-69%
Risk free interest rate
0.6%-0.9%
 
1.4%-2.8%
 
2.0%-3.2%
Expected term (in years)
5.5-5.7
 
6.0-6.1
 
5.9-6.2
Weighted-average fair value of stock options granted
$3.57
 
$10.27
 
$12.98
Weighted-average assumptions for Employee Stock Purchase Plan
 
Employee Stock Purchase Plan for Years Ended December 31,
 
2012
 
2011
 
2010
Employee Stock Purchase Plan
 
 
 
 
 
Expected stock price volatility
56%-63%
 
56%-78%
 
50%-54%
Risk free interest rate
0.2%
 
0.1%
 
0.2%-0.3%
Expected term (in years)
0.5
 
0.5
 
0.5
Weighted-average fair value of purchase rights granted under the purchase plan
$1.58
 
$6.16
 
$6.45
Activity related to nonvested equity stock and stock units
Nonvested Equity Stock and Stock Units
Shares
 
Weighted-Average
Grant-Date Fair Value
Nonvested at December 31, 2009
783,976
 
$
16.24

Granted
302,312
 
$
21.87

Vested
(314,045)
 
$
17.18

Forfeited
(54,236)
 
$
15.76

Nonvested at December 31, 2010
718,007
 
$
18.23

Granted
374,838
 
$
17.86

Vested
(314,401)
 
$
18.15

Forfeited
(14,934)
 
$
21.76

Nonvested at December 31, 2011
763,510
 
$
18.02

Granted
742,009
 
$
6.43

Vested
(393,383)
 
$
17.38

Forfeited
(189,645)
 
$
11.77

Nonvested at December 31, 2012
922,491
 
$
10.24