Fair Value of Financial Instruments Unobservable Inputs (Details) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Long Term
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain on sale of securities	$ 400,000
Level 1 | Short Term | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Unrealized loss	100,000	100,000
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning fair value of Long-term marketable securities	4,717,000	6,946,000
Fair value of securities sold or redeemed	0	2,285,000
Temporary fluctuations in fair value	524,000	56,000
Ending fair value of Long-term marketable securities	$ 5,241,000	$ 4,717,000