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Equity Incentive Plans and Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Equity Incentive Plans and Stock-Based Compensation

Shares available for grant under stock-based incentive plans

		Shares Available for Grant
Shares available as of December 31, 2008			2,556,984
Increase in shares approved for issuance			6,500,000
Stock options granted			(1,487,905	)
Stock options forfeited			2,123,045
Stock options expired under former plans			(1,849,516	)
Nonvested equity stock and stock units granted(1)			(419,214	)
Nonvested equity stock and stock units forfeited(1)			39,000
Total shares available for grant 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

(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.

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, 2008			16,573,739		$	21.19
Options granted			1,487,905			9.21
Options exercised			(1,482,489	)		11.29
Options forfeited			(2,123,045	)		21.34
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			5.49		$	806
Vested or expected to vest at December 31, 2011			14,103,419		$	19.76			5.38		$	806
Options exercisable at December 31, 2011			10,428,578		$	20.26			4.36		$	806

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
$3.82 - $11.31			1,604,986			5.74		$	8.03			964,767		$	7.48
$11.39 - $14.89			1,577,402			5.46		$	14.23			1,043,121		$	14.11
$15.23 - $17.95			1,527,818			3.63		$	16.94			1,406,188		$	16.96
$18.04 - $18.69			1,697,627			4.76		$	18.61			1,621,495		$	18.61
$19.13 - $19.86			1,927,709			5.92		$	19.63			1,521,929		$	19.61
$20.16 - $20.86			196,622			8.42		$	20.37			58,078		$	20.40
$20.93 - $20.93			1,467,812			9.05		$	20.93			245,500		$	20.93
$21.14 - $22.72			1,550,770			7.13		$	22.45			758,296		$	22.24
$22.77 - $26.45			1,617,650			4.46		$	23.75			1,390,004		$	23.83
$27.32 - $46.80			1,419,200			2.82		$	34.62			1,419,200		$	34.62
$3.82 - $46.80			14,587,596			5.49		$	19.73			10,428,578		$	20.26

Weighted-average assumptions for Stock Option Plans

		Stock Option Plans for Years Ended December 31,
		2011		2010		2009
Stock Option Plans
Expected stock price volatility		50% - 75%		49% - 69%		89% - 96%
Risk free interest rate		1.4% - 2.8%		2.0% - 3.2%		1.8% - 2.8%
Expected term (in years)		6.0 - 6.1		5.9 - 6.2		5.3 - 6.1
Weighted-average fair value of stock options granted		$10.27		$12.98		$6.85

Weighted-average assumptions for Employee Stock Purchase Plan

		Employee Stock Purchase Plan for Years Ended December 31,
		2011		2010		2009
Employee Stock Purchase Plan
Expected stock price volatility		56% - 78%		50% - 54%		86% - 92%
Risk free interest rate		0.1%		0.2% - 0.3%		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		$6.16		$6.45		$5.52

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, 2008			821,064		$	18.46
Granted			279,476			11.12
Vested			(290,564	)		17.43
Forfeited			(26,000	)		18.05
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

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