Marketable Securities (Available For Sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 56,401	$ 73,976
Gross Unrealized Holding Gains	7,925	9,022
Gross Unrealized Holding Losses	(1,233)	(497)
Fair Value	63,093	82,501
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	970	1,136
Gross Unrealized Holding Gains	7,239	7,714
Fair Value	8,209	8,850
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	55,431	72,840
Gross Unrealized Holding Gains	686	1,308
Gross Unrealized Holding Losses	(1,233)	(497)
Fair Value	$ 54,884	$ 73,651