Employee Stock Purchase Plan Stock Options and Warrants (Tables)

12 Months Ended

Dec. 31, 2014

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

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

The stock-based compensation expense before income tax expense for the years ended December 31, 2014, 2013 and 2012, consisted of the following (in thousands):

	2014		2013		2012
Cost of goods sold	$	198	$	145	$	245
Research and development	69		87		119
Selling, general, and administrative	1,193		1,235		1,553
Stock-based compensation expense before taxes	$	1,460	$	1,467	$	1,917

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

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:

	2014			2013			2012
Risk-free interest rate	1.53%	-	1.97%	0.65%	-	1.16%	0.54%	-	0.95%
Expected option life	5.0	-	5.5 years	4.2	-	6.0 years	4.2	-	6.0 years
Expected dividend yield	—%			—%			—%
Expected price volatility	34.52%	-	36.90%	34.08%	-	41.67%	42.01%	-	44.56%

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable

The table below presents information related to stock option activity for the years ended December 31, 2014, 2013 and 2012 (in thousands):

	2014		2013		2012
Total intrinsic value of stock options exercised	$	3,505	$	1,649	$	3,472
Cash received from stock option exercises	7,697		3,281		3,325
Excess tax benefit from the exercise of stock options	576		259		877

Schedule of Share-based Compensation, Stock Options, Activity

Changes in stock options for the year ended December 31, 2014, consisted of the following (shares and intrinsic value in thousands):

	Number of Shares		Weighted Average Exercise Price		Remaining Contractual Term (in years)	Intrinsic Value
2014:
Beginning balance	3,008		$	12.14
Granted	666		12.59
Exercised	(878	)	11.03
Forfeited/expired	(5	)	13.52
Outstanding at December 31	2,791		12.60		3.7	$	13,210
Exercisable	1,475		12.44		3.6	7,209
Ending vested and expected to vest	2,710		12.60		1.9	12,833

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

The following table summarizes information about stock options outstanding at December 31, 2014 (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
$	9.71	-	$11.53	778	1.32	$	10.80	678	$	10.93
$	12.06	-	$13.14	779	6.21	12.40		67	13.02
$	13.16	-	$13.16	85	2.48	13.16		70	13.16
$	13.75	-	$16.41	1,149	3.58	13.90		660	13.86
$	9.71	-	$16.41	2,791				1,475