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Stock-Based Compensation
6 Months Ended
Jun. 30, 2018
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 approved stock-based compensation plans and shares issued under the approved member stock purchase plans. The following table summarizes expense associated with these plans (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Compensation cost
$
1,196

 
$
1,132

 
$
4,908

 
$
5,803



The options and units granted by the Corporation had fair values as follows (in thousands):
 
Six Months Ended
 
June 30,
2018
 
July 1,
2017
Stock options
$
7,200

 
$
7,206



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 June 30, 2018:
 
Unrecognized Compensation Expense
(in thousands)
 
Weighted-Average Remaining
Service Period (years)
Non-vested stock options
$
5,238

 
1.2
Non-vested restricted stock units
$
178

 
0.5