Derivative Instruments And Hedging Activities (Schedule Of Derivative Instrument Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Notional Value, Designated	$ 412,465		$ 407,735
Asset Fair Value, Designated	16,443	[1]		[1]
Liability Fair Value, Designated	5,137	[2]	20,046	[2]
Notional Value, Not Designated			38,113
Asset Fair Value, Not Designated			37	[1]
Liability Fair Value, Not Designated			37	[2]
Foreign Currency Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Value, Designated	306,450	[3]	270,931	[3]
Asset Fair Value, Designated	16,443	[1],[3]		[1],[3]
Liability Fair Value, Designated	1,852	[2],[3]	12,369	[2],[3]
Natural Gas Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Value, Designated	3,915	[3]	1,704	[3]
Asset Fair Value, Designated				[1],[3]
Liability Fair Value, Designated	265	[2],[3]	246	[2],[3]
Interest Rate Swaps [Member] | Medium-Term Notes [Member]
Derivatives, Fair Value [Line Items]
Notional Value, Designated		[4]		[4]
Asset Fair Value, Designated		[1],[4]		[1],[4]
Liability Fair Value, Designated		[2],[4]		[2],[4]
Interest Rate Swaps [Member] | Unsecured Commercial Paper [Member]
Derivatives, Fair Value [Line Items]
Notional Value, Designated	102,100	[3]	135,100	[3]
Asset Fair Value, Designated				[1],[3]
Liability Fair Value, Designated	3,020	[2],[3]	7,431	[2],[3]
Derivatives - Securitization Transactions [Member]
Derivatives, Fair Value [Line Items]
Notional Value, Not Designated			38,113
Asset Fair Value, Not Designated			37	[1]
Liability Fair Value, Not Designated			37	[2]
Derivatives - Conduit Facility [Member] | Conduit Facility [Member]
Derivatives, Fair Value [Line Items]
Notional Value, Not Designated
Asset Fair Value, Not Designated		[1]		[1]
Liability Fair Value, Not Designated		[2]		[2]

[1] Included in other current assets

[2] Included in accrued liabilities

[3] Derivative designated as a cash flow hedge

[4] Derivative designated as a fair value hedge