Derivative Instruments And Hedging (Schedule Of Notional Amounts Of Foreign Currency Exchange Contracts And Interest Rate Swap Agreements) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Interest Rate Swaps Commencing March 31, 2010 And Expiring March 30, 2012 [Member]
Derivative [Line Items]
Notional amount of forward fixed interest rate swap		$ 80,000
Interest Rate Swap Commencing March 30, 2012 And Expiring June 30, 2016 [Member]
Derivative [Line Items]
Notional amount of forward fixed interest rate swap	40,000	40,000
Interest Rate Swap Commencing March 28, 2013 And Expiring June 30, 2016 [Member]
Derivative [Line Items]
Notional amount of forward fixed interest rate swap	$ 40,000	$ 40,000