Financial Instruments And Risk Management (Derivatives Not Designated As Hedging Instruments Fair Values Of Derivative Instruments) (Details) (Not Designated As Hedging Instruments [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Asset Derivatives Not Designated as Hedging Instruments, Fair Value	$ 518,729	$ 463,802
Liability Derivatives Not Designated as Hedging Instruments, Fair Value	518,031	471,760
Prepaid Expenses And Other Current Assets [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Asset Derivatives Not Designated as Hedging Instruments, Fair Value	7,129	3,802
Other Assets [Member] | Purchased Cash Convertible Note Hedge [Member]
Derivative [Line Items]
Asset Derivatives Not Designated as Hedging Instruments, Fair Value	511,600	460,000
Other Current Liabilities [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Liability Derivatives Not Designated as Hedging Instruments, Fair Value	6,431	11,760
Long-Term Debt [Member] | Cash Conversion Feature Of Cash Convertible Notes [Member]
Derivative [Line Items]
Liability Derivatives Not Designated as Hedging Instruments, Fair Value	$ 511,600	$ 460,000