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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

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



	Three Months Ended
	March 31, 2017		April 1, 2016
Stock options	$	710	$	609
Restricted stock and restricted stock units	3,959		2,226
Total stock-based compensation expense	$	4,669	$	2,835

Cost of sales	$	142	$	197
Selling, general and administrative expenses	2,159		1,655
Research, development and engineering costs, net	105		177
Other operating expenses, net	2,263		806
Total stock-based compensation expense	$	4,669	$	2,835

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

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	33,636		29.55
Exercised	(343,898	)	21.66
Forfeited or expired	(9,490	)	45.82
Outstanding at March 31, 2017	1,420,220		$	29.77	6.4	$	17.8
Exercisable at March 31, 2017	1,164,993		$	27.94	5.8	$	16.1

The following table summarizes time-vested restricted stock and RSU activity:

The following table summarizes PSU activity:



	Performance- Vested Activity		Weighted Average Fair Value
Nonvested at December 30, 2016	356,586		$	31.87
Granted	370,815		30.58
Forfeited	(134,223	)	31.40
Nonvested at March 31, 2017	593,178		$	31.18