Derivatives (Fair Values Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	$ 1,790	$ 5,071
Derivative Liabilities, Fair Value	(113)	(21,434)
Designated As Hedging Instruments [Member] | Accrued Expenses And Other Current Liabilities [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value		(21,100)
Not Designated As Hedging Instruments [Member] | Accrued Expenses And Other Current Liabilities [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	(113)	(334)
Not Designated As Hedging Instruments [Member] | Other Current Assets [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	$ 1,790	$ 5,071