Financial Instruments And Risk Management (Fair Values Of Derivative Instruments Derivatives Not Designated As Hedging Instruments) (Details) (Not Designated As Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Asset Derivatives Not Designated as Hedging Instruments, Fair Value	$ 463,802	$ 475,068
Liability Derivatives Not Designated as Hedging Instruments, Fair Value	471,760	479,775
Prepaid Expenses And Other Current Assets [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Not Designated as Hedging Instruments, Fair Value	3,802	2,668
Other Assets [Member] | Purchased Cash Convertible Note Hedge [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Not Designated as Hedging Instruments, Fair Value	460,000	472,400
Other Current Liabilities [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives Not Designated as Hedging Instruments, Fair Value	11,760	7,375
Long-Term Debt [Member] | Cash Conversion Feature Of Cash Convertible Notes [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives Not Designated as Hedging Instruments, Fair Value	$ 460,000	$ 472,400