Derivative Instruments And Hedging Activities (Summary Of Notional Amounts Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Total forward contracts notional amount	$ 145,231	$ 162,984
Euro Member Countries, Euro
Derivative [Line Items]
Total forward contracts notional amount	72,632	84,770
Japan, Yen
Derivative [Line Items]
Total forward contracts notional amount	35,257	42,209
Hungary, Forint
Derivative [Line Items]
Total forward contracts notional amount	$ 37,342	$ 36,005