Employee Stock Purchase Plan Stock Options and Warrants Employee Stock Purchase Plan Stock Options and Warrants (Tables)

12 Months Ended

Dec. 31, 2011

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

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

 The stock-based compensation expense before income tax expense for the years ended December 31, 2011, 2010 and 2009, consisted of the following (in thousands):

	2011		2010		2009
Cost of goods sold	$	241	$	201	$	205
Research and development	86		56		57
Selling, general, and administrative	1,317		1,037		920
Stock-based compensation expense before taxes	$	1,644	$	1,294	$	1,182

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

In applying the Black-Scholes methodology to the option grants, the fair value of our stock-based awards granted were estimated using the following assumptions for the periods indicated below:

	2011			2010	2009
Risk-free interest rate	0.68%	-	1.34%	2.24%	2.7%
Expected option life	4.2	-	6.0 years	6.0 years	6.0 years
Expected dividend yield	—%			—%	—%
Expected price volatility	42.11%	-	45.29%	41.4%	42.4%

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]

The table below presents information related to stock option activity for the years ended December 31, 2011, 2010 and 2009 (in thousands):

	2011		2010		2009
Total intrinsic value of stock options exercised	$	9,433	$	1,928	$	2,757
Cash received from stock option exercises	7,197		1,330		1,690
Net income tax benefit from the exercises of stock options	3,122		399		987

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

Changes in stock options for the year ended December 31, 2011, consisted of the following (shares and intrinsic value in thousands):

	Number of Shares		Weighted Average Exercise Price		Remaining Contractual Term (in years)	Intrinsic Value
2011:
Beginning balance	4,389		$	10.56
Granted	844		13.75
Exercised	(1,099	)	7.69
Forfeited/expired	(57	)	13.00
Outstanding at December 31	4,077		11.96		3.5	$	7,877
Exercisable	2,744		11.43		2.5	7,090
Ending vested and expected to vest	4,049		11.95		3.5	7,871

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The following table summarizes information about stock options outstanding at December 31, 2011 (shares in thousands):

			Options Outstanding				Options Exercisable
Range of Exercise			Number Outstanding	Weighted Average Remaining Contractual Life (in years)	Weighted Average Exercise Price		Number Exercisable	Weighted Average Exercise Price
$7.65	-	$9.70	1,021	1.6	$	8.74	926	$	8.64
$9.71	-	$11.53	1,111	3.3	10.99		885	10.85
$12.02	-	$13.75	1,286	5.5	13.25		364	12.10
$13.82	-	$17.34	659	2.8	16.09		569	16.45
$7.65	-	$17.34	4,077				2,744