Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Share-Based Compensation [Abstract]

Allocation of share-based compensation expense

	Three Months Ended March 31,
	2013		2012
	(in thousands)
Cost of revenue	$	532	$	732
Selling, general and administrative		2,426		1,881
Research and development		1,490		1,101
	$	4,448	$	3,714

Summary of options granted under stock option plan

						Weighted
				Weighted		Average		Aggregate
	Number of			Average		Remaining		Intrinsic
	Options			Exercise		Contractual Life		Value
	(in thousands)			Price		(Years)		(in thousands)
Outstanding at December 31, 2012		291		$	36.70
Granted		—			—
Exercised		(28	)		31.93
Forfeited		—			—
Expired		—			—
Outstanding at March 31, 2013		263		$	37.27		4.67	$	13,448
Exercisable at March 31, 2013		224		$	33.62		4.15	$	12,285

Summary of RSU's

				Weighted
				Average
				Remaining
	Number of			Contractual		Aggregate
	Units			Life		Intrinsic Value
	(in thousands)			(Years)		(in thousands)
Outstanding at December 31, 2012		547
Granted		61
Vested/Exercised		(11	)
Forfeited		(3	)
Expired		—
Outstanding at March 31, 2013		594			1.97	$	52,543
Exercisable at March 31, 2013		—			—	$	—