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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Based Compensation Expense
The following table summarizes stock-based compensation expense (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
2017
 
October 1,
2016
 
September 30,
2017
 
October 1,
2016
Stock-based compensation expense
$
956

 
$
959

 
$
6,759

 
$
7,400
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 30,
2017
 
October 1,
2016
Stock options
$
7,206

 
$
7,720

Time-based restricted stock units
$
—

 
$
712
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 September 30, 2017:
 
Unrecognized Compensation Expense
(in thousands)
 
Weighted-Average Remaining
Service Period
(years)
Non-vested stock options
$
4,103

 
1.2
Non-vested restricted stock units
$
474

 
0.8