Equity Incentive Plans and Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Shares available for grant under stock-based incentive plans

A summary of shares available for grant under the Company’s plans is as follows:



	Shares Available for Grant
Shares available as of December 31, 2012	2,729,159
Stock options granted	(1,619,437	)
Stock options forfeited	893,744
Stock options expired under former plans	(291,219	)
Nonvested equity stock and stock units granted (1)	(414,744	)
Nonvested equity stock and stock units forfeited (1)	88,370
Total available for grant as of March 31, 2013	1,385,873

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(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

The following table summarizes stock option activity under the 1997 Plan, 1999 Plan and 2006 Plan for the three months ended March 31, 2013 and information regarding stock options outstanding, exercisable, and vested and expected to vest as of March 31, 2013.



	Options Outstanding
	Number of Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
	(Dollars in thousands, except per share amounts)
Outstanding as of December 31, 2012	13,094,815		$	12.79
Options granted	1,619,437		5.46
Options exercised	—		—
Options forfeited	(893,744	)	11.20
Outstanding as of March 31, 2013	13,820,508		12.03		6.44	$	1,898
Vested or expected to vest at March 31, 2013	12,533,217		12.48		6.21	1,549
Options exercisable at March 31, 2013	5,945,597		19.05		3.82	36

Weighted-average assumptions for Stock Option Plans

The following table presents the weighted-average assumptions used to estimate the fair value of stock options granted that contain only service conditions in the periods presented.



	Stock Option Plans
	Three Months Ended
	March 31,
	2013			2012
Stock Option Plans
Expected stock price volatility	47		%	60		%
Risk free interest rate	0.9		%	0.7		%
Expected term (in years)	5.4			5.6
Weighted-average fair value of stock options granted to employees	$	2.33		$	3.88

Schedule of nonvested equity stock and stock units activity

The following table reflects the activity related to nonvested equity stock and stock units for the three months ended March 31, 2013:



Nonvested Equity Stock and Stock Units	Shares		Weighted- Average Grant-Date Fair Value
Nonvested at December 31, 2012	922,491		$	10.24
Granted	276,496		5.46
Vested	(178,666	)	14.02
Forfeited	(58,911	)	13.97
Nonvested at March 31, 2013	961,410		7.93