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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Based Compensation Expense
The following table summarizes expense associated with these plans (in thousands):
 
Three Months Ended
 
March 31,
2018
 
April 1,
2017
Compensation cost
$
3,712

 
$
4,671
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):
 
Three Months Ended
 
March 31,
2018
 
April 1,
2017
Stock options
$
6,611

 
$
7,206
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 restricted stock units as of March 31, 2018:
 
Unrecognized Compensation Expense
(in thousands)
 
Weighted-Average Remaining
Service Period (years)
Non-vested stock options
$
5,543

 
1.3
Non-vested restricted stock units
$
238

 
0.7