Stock Option Plans and Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

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

Schedule of Stock Options Roll Forward

A summary of option activity under the 2009 Plan for the six months ended June 30, 2014 is presented below:

Options:	Number of Shares		Weighted-Average Exercise Price
	(in thousands)
Outstanding at December 31, 2013	3,143		$15.82
Granted	304		$25.75
Exercised	(582	)	$14.29
Forfeited	(59	)	$18.56
Expired	(7	)	$17.47
Outstanding at June 30, 2014	2,799		$17.15
Vested and expected to vest at June 30, 2014	2,770		$17.10
Exercisable at June 30, 2014	1,727		$15.39

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

A summary of activity of both restricted stock and restricted stock units ("RSUs") for the six months ended June 30, 2014 is presented below:

	Restricted Stock			Restricted Stock Units
	Number of Shares		Weighted-Average Grant Date Fair Value Per Share	Number of Shares		Weighted-Average Grant Date Fair Value Per Share
	(in thousands)			(in thousands)
Non-vested, December 31, 2013	52		$18.43	362		$17.15
Granted	39		$26.46	98		$25.56
Vested	(54	)	$26.47	(84	)	$16.54
Forfeited	—		$0.00	(16	)	$15.83
Non-vested, June 30, 2014	37		$26.47	360		$19.64

PSU % eligible vesting vs Total Shareholder Return - Second year

The following table shows the percent of PSUs granted in 2013 eligible for further time-based vesting based on our percentile placement:

Percentile Placement of Our Total Shareholder Return	% of PSUs Eligible for Time- Based Vesting
Below the 35th percentile	—%
At least the 35th percentile, but below the 50th percentile	50%
At least the 50th percentile	100%

PSU % eligible vesting vs total Shareholder Return placement - First year

The following table shows the percent of PSUs granted in 2012 eligible for further time-based vesting based on our percentile placement:

Percentile Placement of Our Total Shareholder Return	% of PSUs Eligible for Time- Based Vesting
Below the 35th percentile	—%
At least the 35th percentile, but below the 50th percentile	50%
At least the 50th percentile	100%

Schedule of Nonvested Performance-based Units Activity

A summary of activity of the PSUs for the six months ended June 30, 2014 is presented below:

Performance-based Stock Units	Number of Shares		Weighted-Average Grant Date Fair Value Per Share
	(in thousands)
Non-vested, December 31, 2013	225		$13.32
Granted	135		$16.49
Vested	(74	)	$13.66
Forfeited	(8	)	$10.93
Non-vested, June 30, 2014	278		$14.72

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

 The following table shows a summary of the share-based compensation expense included in the condensed consolidated statements of operations (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Cost of revenues	$	264	$	324	$	532	$	629
Research and development	380		326		749		615
Selling, general and administrative	2,076		2,037		4,168		4,369
Total share-based compensation expenses	$	2,720	$	2,687	$	5,449	$	5,613