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Equity Incentive Plans and Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 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, 2010		5,348,162
Stock options granted		(1,712,211	)
Stock options forfeited		447,417
Stock options expired under former plans		(262,716	)
Nonvested equity stock and stock units granted (1)		(320,331	)
Nonvested equity stock and stock units forfeited (1)		22,401
Total available for grant as of June 30, 2011		3,522,722

(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
				Weighted			Average
				Average			Remaining		Aggregate
		Number of		Exercise Price			Contractual		Intrinsic
		Shares		Per Share			Term(in years)		Value
		(Dollars in thousands, except per share amounts)
Outstanding as of December 31, 2010		13,969,383		$	18.85
Options granted		1,712,211		20.71
Options exercised		(478,974	)	10.29
Options forfeited		(447,417	)	11.48
Outstanding as of June 30, 2011		14,755,203		19.57			5.61		$	14,793
Vested or expected to vest at June 30, 2011		14,209,999		19.56			5.49		14,406
Options exercisable at June 30, 2011		10,199,075		19.76			4.36		10,787

Weighted-average assumptions for Stock Option Plans

		Stock Option Plans
		Three Months Ended June 30,						Six Months Ended June 30,
		2011			2010			2011			2010
Stock Option Plans
Expected stock price volatility		50		%	69		%	50-52%			61-69%
Risk free interest rate		2.6		%	3.2		%	2.6-2.8%			2.4-3.2%
Expected term (in years)		6.1			6.1			6.0 - 6.1			5.9 – 6.1
Weighted-average fair value of stock options granted		$	8.58		$	14.38		$	10.71		$	13.27

Weighted-average assumptions for Employee Stock Purchase Plan

		Employee Stock Purchase Plan
		Three Months Ended June 30,						Six Months Ended June 30,
		2011			2010			2011			2010
Employee Stock Purchase Plan
Expected stock price volatility		56		%	54		%	56		%	54		%
Risk free interest rate		0.1		%	0.3		%	0.1		%	0.3		%
Expected term (in years)		0.5			0.5			0.5			0.5
Weighted-average fair value of purchase rights granted under the purchase plan		$	5.96		$	7.46		$	5.96		$	7.46

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, 2010		718,007		$	18.23
Granted		213,554		20.86
Vested		(147,197	)	17.30
Forfeited		(14,934	)	21.76
Nonvested at June 30, 2011		769,430		19.07

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