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INVESTMENTS IN SECURITIES (Tables)
12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-For-Sale Securities
The following table summarizes our investments in available-for-sale securities:
 
December 31, 2017
 
December 25, 2016
 

Cost
 
Fair
Value
 

Cost
 
Fair
Value
 
(In thousands)
Cash equivalents:
 
 
 
 
 
 
 
Fixed income securities
$
330,456

 
$
330,456

 
$
140,480

 
$
140,480

Other
942

 
942

 
61

 
61