Derivative Financial Instruments And Fair Value Measurements (Summary Of Derivative Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Interest Rate Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset, Fair Value		$ 4,156
Liability, Fair Value	102,297	72,437
Interest Rate Swap Contracts [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Asset, Fair Value		4,156
Liability, Fair Value	102,297	72,437
Commodities Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset, Fair Value	2,099	4,232
Liability, Fair Value	3,876	947
Commodities Contracts [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Asset, Fair Value	2,099	4,232
Liability, Fair Value	3,876	947
Foreign Currency Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset, Fair Value	411
Foreign Currency Contracts [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Asset, Fair Value	$ 411