Derivatives (Details) (USD $)	12 Months Ended																								1 Months Ended	12 Months Ended
	Dec. 31, 2011		Jan. 01, 2011		Jan. 02, 2010	Dec. 31, 2011 Designated as Hedging Instrument [Member]	Jan. 01, 2011 Designated as Hedging Instrument [Member]	Jan. 02, 2010 Designated as Hedging Instrument [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member]	Jan. 01, 2011 Not Designated as Hedging Instrument [Member]	Jan. 02, 2010 Not Designated as Hedging Instrument [Member]	Dec. 31, 2011 Forward Contracts [Member] Commodity Contract [Member]	Jan. 01, 2011 Swap [Member] Natural Gas [Member] Accrued Expenses [Member]	Jan. 02, 2010 Swap [Member] Natural Gas [Member] Accrued Expenses [Member]	Dec. 31, 2011 Swap [Member] Natural Gas [Member] Other Current Assets [Member]	Jan. 01, 2011 Swap [Member] Natural Gas [Member] Other Current Assets [Member]	Jan. 01, 2011 Swap [Member] Natural Gas [Member] Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Jan. 02, 2010 Swap [Member] Natural Gas [Member] Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Dec. 31, 2011 Swap [Member] Natural Gas Swaps and Options [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member]	Jan. 01, 2011 Swap [Member] Natural Gas Swaps and Options [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member]	Jan. 01, 2011 Swap [Member] Heating Oil [Member] Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Jan. 02, 2010 Swap [Member] Heating Oil [Member] Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Dec. 31, 2011 Swap [Member] Heating Oil [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member]	Jan. 01, 2011 Swap [Member] Heating Oil [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Interest Rate Swap [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Interest Rate Swap [Member]		Jan. 01, 2011 Cash Flow Hedging [Member] Interest Rate Swap [Member]		Dec. 31, 2011 Cash Flow Hedging [Member] Swap [Member] Natural Gas [Member]		Jan. 01, 2011 Cash Flow Hedging [Member] Swap [Member] Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Payment for Cash Flow Hedge																									$ 2,000,000
Number of months cash flow hedge gain (loss) reclassified over	12
Amount reclassified from accumulated other comprehensive loss into earnings over next 12 months	900,000
Cash Flow Hedge Loss Reclassified to Earnings	1,200,000
Asset Derivatives Fair Value	6,000		428,000			0	135,000		6,000	293,000					0	135,000			0	212,000			6,000	81,000
Liability Derivatives Fair Value			836,000		16,000		669,000	16,000		167,000	0		669,000	16,000			143,000	0			24,000	0
Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(1,229,000)	[1]	(980,000)	[1]																						0	[1]	(723,000)	[1]	(1,229,000)	[1]	(257,000)	[1]
Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(1,604,000)	[2]	(1,712,000)	[2]																						(1,163,000)	[2]	(1,551,000)	[2]	(441,000)	[2]	(161,000)	[2]
Gain Recognized in Income on Derivatives, Ineffective Portion and Amount Excluded from Effectiveness Testing	0	[3]	28,000	[3]																						0	[3]	41,000	[3]	0	[3]	(13,000)	[3]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(1,229,000)		(1,000,000)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	500,000		400,000
Forward Purchase Amount												$ 6,600,000

[1] Amount recognized in accumulated OCI (effective portion) is reported as accumulated other comprehensive loss of approximately $1.2 million and approximately $1.0 million recorded net of taxes of approximately $0.5 million and approximately $0.4 million for the year ended December 31, 2011 and January 1, 2011, respectively.

[2] Gains and (losses) reclassified from accumulated OCI into income (effective portion) for interest rate swaps and natural gas swaps is included in interest expense and cost of sales, respectively, in the Company’s consolidated statements of operations.

[3] Gains and (losses) recognized in income on derivatives (ineffective portion) for interest rate swaps and natural gas swaps is included in other, net in the Company’s consolidated statements of operations.