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INVESTMENTS IN SECURITIES (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 28, 2014
Sep. 29, 2013
Sep. 28, 2014
Sep. 28, 2014
Fixed income securities [Member]
Dec. 29, 2013
Fixed income securities [Member]
Sep. 28, 2014
Other [Member]
Dec. 29, 2013
Other [Member]
Sep. 28, 2014
Fixed income securities [Member]
Dec. 29, 2013
Fixed income securities [Member]
Fixed income securities, Amortized Cost       $ 433,413,000 $ 103,121,000 $ 19,577,000 $ 56,000 $ 0 $ 96,902,000
Fixed income securities, Fair Value       433,413,000 103,124,000 19,577,000 56,000 0 96,902,000
Realized gain on sale of securities 100,000 0 300,000            
Realized loss on sale of securities $ 7,700   $ 8,100