Derivative Financial Instruments (Balance Sheet Location) (Details) (USD $)			9 Months Ended
	Sep. 29, 2012	Dec. 31, 2011	Sep. 29, 2012 Diesel Fuel Swap [Member]	Sep. 29, 2012 Diesel Fuel Swap [Member] Accounts Payable and Accrued Expenses [Member]	Dec. 31, 2011 Diesel Fuel Swap [Member] Accounts Payable and Accrued Expenses [Member]	Sep. 29, 2012 Diesel Fuel Swap [Member] Prepaid Expenses and Other Current Assets [Member]	Dec. 31, 2011 Diesel Fuel Swap [Member] Prepaid Expenses and Other Current Assets [Member]	Sep. 29, 2012 Cash Flow Hedging [Member] Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount of derivatives								$ 50,000,000
Expected hedging percentage of diesel fuel requirements for next twelve months			50.00%
Deferred net losses, net of tax			200,000
Derivative, Fair Value, Net [Abstract]
Derivative, fair value, net	$ (289,000)	$ (91,000)		$ (407,000)	$ (256,000)	$ 118,000	$ 165,000