Derivative Instruments And Hedging Activities (Summary Of Notional Amounts Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Total forward contracts notional amount	$ 128,221	$ 136,059
Euro [Member]
Derivative [Line Items]
Total forward contracts notional amount	72,172	60,992
Japanese Yen [Member]
Derivative [Line Items]
Total forward contracts notional amount	29,661	43,569
Korean Won [Member]
Derivative [Line Items]
Total forward contracts notional amount		3,309
Hungarian Forint [Member]
Derivative [Line Items]
Total forward contracts notional amount	$ 26,388	$ 28,189