Stock-Based Compensation

3 Months Ended

Mar. 30, 2019

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 summarizes expense associated with these plans (in thousands):

	Three Months Ended
	March 30, 2019		March 31, 2018
Compensation cost	$	2,451	$	3,712

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

	Three Months Ended
	March 30, 2019		March 31, 2018
Stock options	$	6,211	$	6,611
Restricted stock units	$	361	$	—

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 March 30, 2019:

	Unrecognized Compensation Expense (in thousands)		Weighted-Average Remaining Service Period (years)
Non-vested stock options	$	6,952	1.2
Non-vested restricted stock units	$	999	1.2