Derivative Financial Instruments (Derivative Instruments Located On The Condensed Consolidated Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 61	$ 22,380
Derivative Liabilities	9,121	8,876
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		22,380
Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets
Interest Rate Contracts [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	2,639	3,789
Interest Rate Contracts [Member] | Other Long Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	765	2,684
Commodity Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		22,380
Commodity Contracts [Member] | Other Long Term Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	61
Commodity Contracts [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	5,439	2,032
Commodity Contracts [Member] | Other Long Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 278	$ 371