Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2011

Shareholders' Equity

Schedule of stock option activity

	Shares Subject to Options			Weighted Average Option Price		Weighted Average Remaining Contractual Term (Yrs)		Aggregate Intrinsic Value (in millions) (b)
Outstanding at December 31, 2010		4,718,648		$	9.99
Granted		904,244			13.91
Exercised		(354,559	)		9.29			$	3.2
Forfeited		(172,080	)		12.76
Outstanding at December 31, 2011		5,096,253		$	10.64		6.3	$	11.8
Vested at December 31, 2011		2,769,107		$	8.79		4.8	$	10.4
Vested and expected to vest at December 31, 2011 (a)		4,975,241		$	10.59		6.3	$	11.7

(a)

In addition to the options that are vested at December 31, 2011, the Company expects a portion of the unvested options to vest in the future. Options expected to vest in the future are determined by applying an estimated forfeiture rate to the options that are unvested as of December 31, 2011.

(b)

The aggregate intrinsic value is based on the positive difference between the fair value of the Company's common stock price of $12.42 on December 31, 2011, or the date of exercises, as appropriate, and the exercise price of the underlying stock options.

Schedule of restricted stock activity

	Shares Subject to Restriction			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2010		247,258		$	8.02
Granted		156,823			21.28
Vested		(167,549	)		6.70
Forfeited		(300	)		7.55
Outstanding at December 31, 2011		236,232		$	17.76