Financial Instruments And Risk Management (Derivatives Not Designated As Hedging Instruments Fair Values Of Derivative Instruments) (Details) (Not designated as hedging instruments, USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Asset Derivatives Designated as Hedging Instruments, Fair Value	$ 430,232	$ 463,802
Liability Derivatives Designated as Hedging Instruments, Fair Value	430,861	471,760
Prepaid expenses and other current assets | Foreign currency forward contracts
Derivative [Line Items]
Asset Derivatives Designated as Hedging Instruments, Fair Value	4,132	3,802
Other assets | Purchased cash convertible note hedge
Derivative [Line Items]
Asset Derivatives Designated as Hedging Instruments, Fair Value	426,100	460,000
Other current liabilities | Foreign currency forward contracts
Derivative [Line Items]
Liability Derivatives Designated as Hedging Instruments, Fair Value	4,761	11,760
Long-term debt | Cash conversion feature of Cash Convertible Notes
Derivative [Line Items]
Liability Derivatives Designated as Hedging Instruments, Fair Value	$ 426,100	$ 460,000