Derivative Instruments (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended								12 Months Ended
	Apr. 04, 2011	Dec. 31, 2013	Jan. 01, 2013	Jan. 03, 2012	Dec. 31, 2013 Swap Agreements 2008 [Member] Interest Rate Swap [Member]	Jan. 01, 2013 Swap Agreements 2008 [Member] Interest Rate Swap [Member]	Mar. 31, 2011 Swap Agreements 2008 [Member] Interest Rate Swap [Member]	Feb. 28, 2011 Swap Agreements 2008 [Member] Interest Rate Swap [Member]	Apr. 04, 2011 Swap Agreements 2011 [Member] agreement	Dec. 31, 2013 Swap Agreements 2011 [Member] Interest Rate Swap [Member]	Apr. 04, 2011 Swap Agreements 2011 [Member] Interest Rate Swap [Member]	Apr. 04, 2011 Swap Agreement One 2011 [Member] Interest Rate Swap [Member]	Apr. 04, 2011 Swap Agreement Two 2011 [Member] Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount of derivative							$ 14,000,000	$ 15,000,000			$ 17,500,000	$ 20,000,000	$ 17,500,000
Gain on interest rate cash flow hedge ineffectiveness					200,000	27,000				174,000
Fair value of derivative							500,000					0	500,000
Number of derivative agreements									2
Fixed interest rate												1.59%	3.06%
Basis spread on variable rate (higher of this rate or one-month LIBOR)												1.25%	1.25%
Unrealized income on cash flow hedges, before tax		0	196,000	225,000
Unrealized income on cash flow hedges, net of tax			28,000
Realized loss (pretax) recognized in interest expense	$ 202,000	$ 0	$ 382,000	$ 434,000