Employee Stock Purchase Plan Stock Options and Warrants (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015, 2014 and 2013, consisted of the following (in thousands):

	2015		2014		2013
Cost of goods sold	$	398	$	198	$	145
Research and development	122		69		87
Selling, general, and administrative	1,723		1,193		1,235
Stock-based compensation expense before taxes	$	2,243	$	1,460	$	1,467

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:

	2015			2014			2013
Risk-free interest rate	1.53%	-	1.66%	1.53%	-	1.97%	0.65%	-	1.16%
Expected option life	5.0			5.0	-	5.5 years	4.2	-	6.0 years
Expected dividend yield	—%			—%			—%
Expected price volatility	33.72%	-	35.11%	34.52%	-	36.90%	34.08%	-	41.67%

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, 2015, 2014 and 2013 (in thousands):

	2015		2014		2013
Total intrinsic value of stock options exercised	$	7,548	$	3,505	$	1,649
Cash received from stock option exercises	6,227		7,697		3,281
Excess tax benefit from the exercise of stock options	2,124		576		259

Schedule of Share-based Compensation, Stock Options, Activity

Changes in stock options for the year ended December 31, 2015, consisted of the following (shares and intrinsic value in thousands):

	Number of Shares		Weighted Average Exercise Price		Remaining Contractual Term (in years)	Intrinsic Value
2015:
Beginning balance	2,791		$	12.59
Granted	618		18.16
Exercised	(858	)	11.63
Forfeited/expired	(143	)	14.38
Outstanding at December 31	2,408		14.25		4.3	$	10,752
Exercisable	2,329		14.23		4.3	10,461
Ending vested and expected to vest	992		13.34		2.9	5,206

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, 2015 (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
$	9.95	-	$12.91	671	5.20	$	11.82	187	$	11.85
$	13.14	-	$13.16	216	3.36	13.15		129	13.15
$	13.75	-	$13.75	638	2.61	13.75		511	13.75
$	13.77	-	$21.98	883	5.19	16.76		165	13.92
$	9.95	-	$21.98	2,408				992