Stock-Based Compensation (Tables)

9 Months Ended

Sep. 29, 2017

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

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

The components and classification of stock-based compensation expense were as follows (in thousands):

	Three Months Ended					Nine Months Ended
	September 29, 2017			September 30, 2016		September 29, 2017		September 30, 2016
Stock options	$	372		$	663	$	1,365	$	1,857
Restricted stock and restricted stock units	1,573			1,554		8,530		5,322
Total stock-based compensation expense	$	1,945		$	2,217	$	9,895	$	7,179
Cost of sales	$	131		$	158	$	612	$	505
Selling, general and administrative expenses	1,874			1,677		6,766		4,860
Research, development and engineering costs, net	144			115		428		408
Other operating expenses, net	(204		)	267		2,089		1,406
Total stock-based compensation expense	$	1,945		$	2,217	$	9,895	$	7,179

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

The weighted average fair value and assumptions used to value options granted are as follows:

	Nine Months Ended
	September 29, 2017			September 30, 2016
Weighted average fair value	$	12.86		$	9.25
Risk-free interest rate	1.77		%	1.56		%
Expected volatility	37		%	26		%
Expected life (in years)	4.5			5.0
Expected dividend yield	—		%	—		%

Schedule of Share-based Compensation, Stock Options Activity

The following table summarizes the Company’s stock option activity:

	Number of Stock Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (In Years)	Aggregate Intrinsic Value (In Millions)
Outstanding at December 30, 2016	1,739,972		$	28.26
Granted	125,020		38.78
Exercised	(680,065	)	25.11
Forfeited or expired	(118,167	)	45.87
Outstanding at September 29, 2017	1,066,760		$	29.55	5.9	$	23.0
Exercisable at September 29, 2017	818,663		$	27.24	5.0	$	19.6

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

The following table summarizes restricted stock and RSU activity:

	Time-Vested Activity		Weighted Average Fair Value
Nonvested at December 30, 2016	39,394		$	45.51
Granted	304,857		33.98
Vested	(62,543	)	32.45
Forfeited	(34,525	)	37.83
Nonvested at September 29, 2017	247,183		$	35.67

The following table summarizes PSU activity:

	Performance- Vested Activity		Weighted Average Fair Value
Nonvested at December 30, 2016	356,586		$	31.87
Granted	419,112		31.62
Forfeited	(301,003	)	30.76
Nonvested at September 29, 2017	474,695		$	32.35