Employee Stock Purchase Plan Stock Options and Warrants (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016, 2015 and 2014, consisted of the following (in thousands):

	2016		2015		2014
Cost of goods sold	$	472	$	398	$	198
Research and development	184		122		69
Selling, general, and administrative	1,850		1,723		1,193
Stock-based compensation expense before taxes	$	2,506	$	2,243	$	1,460

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:

	2016			2015			2014
Risk-free interest rate	1.15%	-	1.40%	1.53%	-	1.66%	1.53%	-	1.97%
Expected option life	5.0 years			5.0 years			5.0	-	5.5 years
Expected dividend yield	—%			—%			—%
Expected price volatility	34.28%	-	37.06%	33.72%	-	35.11%	34.52%	-	36.90%

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, 2016, 2015 and 2014 (in thousands):

	2016		2015		2014
Total intrinsic value of stock options exercised	$	3,648	$	7,548	$	3,505
Cash received from stock option exercises	4,577		6,227		7,697
Excess tax benefit from the exercise of stock options	669		2,124		576

Schedule of Share-based Compensation, Stock Options, Activity

Changes in stock options for the year ended December 31, 2016, consisted of the following (shares and intrinsic value in thousands):

	Number of Shares		Weighted Average Exercise Price		Remaining Contractual Term (in years)	Intrinsic Value
Beginning balance	2,408		$	14.26
Granted	880		17.43
Exercised	(362	)	13.61
Forfeited/expired	(109	)	14.52
Outstanding at December 31	2,817		15.32		4.4	$	31,476
Exercisable	1,033		13.64		2.7	13,274
Ending vested and expected to vest	2,718		15.27		4.4	30,512

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, 2016 (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	-	$13.16	772	3.70	$	12.11	393	$	12.23
$13.75	-	$16.05	1,181	4.02	$	14.84	533	$	13.77
$16.41	-	$20.27	747	5.54	$	18.35	103	$	18.06
$21.71	-	$22.00	117	6.54	$	21.94	4	$	21.98
$9.95	-	$22.00	2,817				1,033