Share-Based Payments (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of weighted average assumptions

	Weighted Average Assumptions
	Stock Options				Employee Stock Purchase Plan
	For the Three Months Ended March 31, 2013		For the Three Months Ended March 31, 2012		For the Three Months Ended March 31, 2013		For the Three Months Ended March 31, 2012
Expected volatility	62	%	65	%	64	%	66	%
Expected dividends	—		—		—		—
Expected life (years)	6.2		6.5		0.5		0.5
Risk-free interest rate	1.4	%	1.4	%	0.1	%	0.1	%

Schedule of nonvested shares of restricted stock

A summary of the status of nonvested shares of restricted stock as of March 31, 2013 and the changes during the three months then ended are presented below (in thousands, except fair values):

	Number of Shares		Weighted Average Grant Date Fair Value
Nonvested at January 1, 2013	1,137		$	14.61
Granted	146		12.58
Vested	(58	)	14.39
Forfeited	(21	)	14.60

Nonvested at March 31, 2013	1,204		$	14.37

Summarized information about time-based or performance-based vesting schedules

Vesting Schedule		Nonvested Shares
Time-based		347
Performance-based		857

Nonvested at March 31, 2013		1,204