Financial Instruments And Risk Management (Derivatives Designated As Hedging Instruments Fair Values Of Derivative Instruments) (Details) (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	$ 36,848	$ 29,773
Liability Derivatives Designated as Hedging Instruments, Fair Value	67,441	57,733
Prepaid expenses and other current assets | Interest rate swap
Derivative [Line Items]
Asset Derivatives Designated as Hedging Instruments, Fair Value	36,848	29,773
Other current liabilities | Interest rate swap
Derivative [Line Items]
Liability Derivatives Designated as Hedging Instruments, Fair Value	4,386	658
Other current liabilities | Foreign currency forward contracts
Derivative [Line Items]
Liability Derivatives Designated as Hedging Instruments, Fair Value	$ 63,055	$ 57,075