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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 26, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Based Compensation Expense
The following table summarizes expense associated with these plans (in thousands):
Three Months EndedNine Months Ended
September 26,
2020		September 28,
2019		September 26,
2020		September 28,
2019
Compensation cost$1,087 $1,336 $6,746 $5,408 
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period
The options and units granted by the Corporation had fair values as follows (in thousands):
Nine Months Ended
September 26,
2020		September 28,
2019
Stock options$— $6,211 
Restricted stock units$6,431 $361 
Performance stock units$5,920 $— 
Schedule of Unrecognized Compensation Cost, Nonvested Awards
The following table summarizes unrecognized compensation expense and the weighted-average remaining service period for non-vested stock options and stock units as of September 26, 2020:
Unrecognized Compensation Expense
(in thousands)		Weighted-Average Remaining
Service Period (years)
Non-vested stock options$1,519 1.1
Non-vested restricted stock units$1,994 0.9
Non-vested performance stock units$876 1.3