Stock-Based Compensation

9 Months Ended

Sep. 29, 2018

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

Stock-Based Compensation

Stock-Based Compensation

The Corporation measures stock-based compensation expense at grant date, based on the fair value of the award, and recognizes expense over the employees' requisite service periods. Stock-based compensation expense is the cost of stock options and time-based restricted stock units issued under the shareholder approved stock-based compensation plans and shares issued under the shareholder approved member stock purchase plans. The following table summarizesexpense associated with these plans (in thousands):

	Three Months Ended				Nine Months Ended
	September 29, 2018		September 30, 2017		September 29, 2018		September 30, 2017
Compensation cost	$	1,307	$	956	$	6,215	$	6,759

The options and units granted by the Corporation had fair values as follows (in thousands):

	Nine Months Ended
	September 29, 2018		September 30, 2017
Stock options	$	7,200	$	7,206
Restricted stock units	$	76	$	—

The following table summarizes unrecognized compensation expense and the weighted-average remaining service period for non-vested stock options and restricted stock units as of September 29, 2018:

	Unrecognized Compensation Expense (in thousands)		Weighted-Average Remaining Service Period (years)
Non-vested stock options	$	4,419	1.2
Non-vested restricted stock units	$	980	1.1