Stock Option Plans and Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

Stock Option Plans and Share-Based Compensation [Abstract]

Schedule of Stock Options Roll Forward [Table Text Block]

A summary of aggregate option activity for the nine months ended September 30, 2012 is presented below:

Options:	Number of Shares		Weighted- Average Exercise Price
	(in thousands)
Outstanding at December 31, 2011	4,693		$	13.36
Granted	473		$	15.15
Exercised	(362	)	$	8.61
Forfeited	(65	)	$	13.71
Expired	(100	)	$	21.58
Outstanding at September 30, 2012	4,639		$	13.73
Exercisable at September 30, 2012	3,513		$	13.60

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

A summary of activity of both restricted stock and RSUs for the nine months ended September 30, 2012 is presented below:

	Restricted Stock				Restricted Stock Units
			Weighted -				Weighted -
	Number of Shares		Average Grant Date Fair Value Per Share		Number of Shares		Average Grant Date Fair Value Per Share
	(in thousands)				(in thousands)
Non-vested, December 31, 2011	68		$	14.71	287		$	13.03
Granted	67		$	14.19	218		$	14.80
Vested	(68	)	$	14.71	(86	)	$	12.76
Forfeited	—		—		(16	)	$	14.46
Non-vested, September 30, 2012	67		$	14.19	403		$	13.98

PSU % eligible vesting vs total Shareholder Return placement - First year [Table Text Block]

The following table shows the percent of PSUs granted in 2011 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, but below the 65th percentile	100%
At least the 65th percentile, but below the 75th percentile (1)	110% to 119%
At or above the 75th percentile	120%

(1)The actual percentage of PSUs eligible for further time-based vesting is based on straight-line interpolation, where, for example, if the ranking is the 70th percentile, then the vesting percentage is 115%.

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PSU % eligible vesting vs Total Shareholder Return - Second year [Table Text Block]

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 [Table Text Block]

A summary of activity of the PSUs for the nine months ended September 30, 2012 is presented below:

			Weighted - Average Grant Date Fair Value Per
Performance-based Stock Units	Number of Shares		Share
	(in thousands)
Non-vested, December 31, 2011	100		$	11.15
Granted	133		$	10.94
Vested	(45	)	$	11.15
Forfeited	—		—
Non-vested, September 30, 2012	188		$	11.00

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

The impact on our results for share-based compensation for the three months and nine months ended September 30, 2012 and 2011 was as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Cost of product and service revenues	$	275	$	358	$	776	$	1,108
Research and development expenses	232		333		686		1,005
Selling, general and administrative expenses	1,854		1,720		5,319		5,141
Total share-based compensation expenses	$	2,361	$	2,411	$	6,781	$	7,254