Derivative Instruments And Hedging (Schedule Of Notional Amounts Of Foreign Currency Derivative Sale, Purchase And Forward Fixed Interest Rate Swap Agreement Contracts) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Notional amount of interest rate swaps	$ 160,000	$ 80,000
Interest Rate Swaps Expiring March 30, 2012 [Member]
Notional amount of interest rate swaps	80,000	80,000
Interest Rate Swaps Expiring June 30, 2016 [Member]
Notional amount of interest rate swaps	$ 80,000