Financial Instruments and Risk Management (Derivatives Not Designated as Hedging Instruments Fair Values of Derivative Instruments) (Details) (Not Designated as Hedging Instrument [Member], USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Asset Derivatives Designated as Hedging Instrument, Fair Value	$ 584,133	$ 483,393
Liability Derivatives Designated as Hedging Instrument, Fair Value	583,135	480,129
Prepaid Expenses and Other Current Assets [Member] | Foreign Currency Forward Contracts [Member]
Asset Derivatives Designated as Hedging Instrument, Fair Value	2,733	10,993
Other Current Liabilities [Member] | Foreign Currency Forward Contracts [Member]
Liability Derivatives Designated as Hedging Instrument, Fair Value	1,735	7,729
Other Assets [Member] | Purchased Cash Convertible Note Hedge [Member]
Asset Derivatives Designated as Hedging Instrument, Fair Value	581,400	472,400
Long-Term Debt [Member] | Cash Conversion Feature of Cash Convertible Notes [Member]
Liability Derivatives Designated as Hedging Instrument, Fair Value	$ 581,400	$ 472,400