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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 30, 2018
Share-based Compensation [Abstract]  
Share-Based Compensation, Restricted Stock Units Award Activity
The number of unvested restricted stock unit awards outstanding as of March 30, 2018 is as follows (1):
 
 
 
 
 
 Weighted-average grant date fair
 
Weighted-average remaining
 
Aggregate intrinsic value (in
 
 
 
Number of awards outstanding
 
value
 
contractual term (years)
 
thousands)  (2)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance as of December 29, 2017
 
 
592,592
 
$
45.91
 
 
 
 
 
 
 
Awards granted
 
 
198,846
 
 
80.14
 
 
 
 
 
 
 
Awards vested
 
 
(267,760)
 
 
54.28
 
 
 
 
 
 
 
Awards forfeited
 
 
-
 
 
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance as of March 30, 2018
 
 
523,678
 
$
54.63
 
 
2.3
 
$
41,187
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(1) Does not include employee stock purchase plans or stock option plans.
(2) The intrinsic value is calculated as the market value as of the end of the fiscal period. As reported by the NASDAQ Global Select Market, the market value as of March 30, 2018 was $78.65.