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Equity Incentive Plans and Stock-Based Compensation (Tables)

9 Months Ended

Sep. 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		(2,199,761	)
Stock options forfeited		770,903
Stock options expired under former plans		(471,913	)
Nonvested equity stock and stock units granted (1)		(440,331	)
Nonvested equity stock and stock units forfeited (1)		22,401
Total available for grant as of September 30, 2011		3,029,461

(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
		Number of Shares		Weighted Average Exercise Price Per Share			Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
		(Dollars in thousands, except per share amounts)
Outstanding as of December 31, 2010		13,969,383		$	18.85
Options granted		2,199,761		19.27
Options exercised		(757,888	)	8.50
Options forfeited		(770,903	)	13.42
Outstanding as of September 30, 2011		14,640,353		19.74			5.67		$	10,378
Vested or expected to vest at September 30, 2011		14,098,821		19.77			5.55		10,063
Options exercisable at September 30, 2011		10,196,979		20.22			4.47		6,990

Weighted-average assumptions for Stock Option Plans

		Stock Option Plans
		Three Months Ended September 30,						Nine Months Ended September 30,
		2011			2010			2011		2010
Stock Option Plans
Expected stock price volatility		75		%	60		%	50-75%		60-69%
Risk free interest rate		2.3		%	2.3		%	2.3-2.8%		2.3-3.2%
Expected term (in years)		6.1			6.1			6.0 - 6.1		5.9 – 6.1
Weighted-average fair value of stock options granted		$	9.48		$	10.88		$10.43		$13.15

Weighted-average assumptions for Employee Stock Purchase Plan

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

* No shares were issued under the Employee Stock Purchase Plans during the three months ended September 30, 2011 and 2010, respectively.

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		293,554		18.99
Vested		(245,697	)	17.59
Forfeited		(14,934	)	21.76
Nonvested at September 30, 2011		750,930		18.67

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