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(6) Fair Value of Financial Instruments Derivative Instruments (Details) (6.20% senior notes, USD $) In Thousands, unless otherwise specified		3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 01, 2012 Interest Rate Swap [Member]	Jul. 03, 2011 Interest Rate Swap [Member]	Jul. 01, 2012 Interest Rate Swap [Member]	Jul. 03, 2011 Interest Rate Swap [Member]	Jul. 01, 2012 Interest Rate Swap [Member] Designated as Hedging Instrument [Member] Fair Value Hedging [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Jan. 01, 2012 Interest Rate Swap [Member] Designated as Hedging Instrument [Member] Fair Value Hedging [Member] Estimate of Fair Value, Fair Value Disclosure [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.20%
Notional amount of interest rate swaps		$ 225,000		$ 225,000
Interest rate swaps						10,254	11,695
Interest income on interest rate swaps		$ 1,404	$ 1,435	$ 2,730	$ 2,848