Financial Instruments And Risk Management (Fair Values Of Derivative Instruments, Derivatives Designated As Hedging Instruments) (Details) (Designated as hedging instrument, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Asset Derivatives, Fair Value	$ 38,926	$ 36,647
Liability Derivatives, Fair Value	8,203	25,686
Prepaid expenses and other current assets | Interest rate swaps
Derivative [Line Items]
Asset Derivatives, Fair Value	35,026	36,647
Prepaid expenses and other current assets | Foreign currency forward contracts
Derivative [Line Items]
Asset Derivatives, Fair Value	3,900	0
Other current liabilities | Interest rate swaps
Derivative [Line Items]
Liability Derivatives, Fair Value	8,203	9,823
Other current liabilities | Foreign currency forward contracts
Derivative [Line Items]
Liability Derivatives, Fair Value	$ 0	$ 15,863