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Stock-Based Compensation
 9 Months Ended
Sep. 28, 2019
Share-based Payment Arrangement [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
 
Nine Months Ended
 
September 28,
2019
 
September 29,
2018
 
September 28,
2019
 
September 29,
2018
Compensation cost
$
1,336

 
$
1,307

 
$
5,408

 
$
6,215



The options and units granted by the Corporation had fair values as follows (in thousands):
 
Nine Months Ended
 
September 28,
2019
 
September 29,
2018
Stock options
$
6,211

 
$
7,200

Restricted stock units
$
361

 
$
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 28, 2019:
 
Unrecognized Compensation Expense
(in thousands)
 
Weighted-Average Remaining
Service Period (years)
Non-vested stock options
$
4,237

 
1.1
Non-vested restricted stock units
$
516

 
1.1