Derivative Instruments And Hedging Activities (Summary Of Notional Amounts Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Total forward contracts notional amount	$ 177,505	$ 199,113
Euro [Member]
Derivative [Line Items]
Total forward contracts notional amount	78,912	97,198
Japanese Yen [Member]
Derivative [Line Items]
Total forward contracts notional amount	5,296	7,798
Hungarian Forint [Member]
Derivative [Line Items]
Total forward contracts notional amount	58,417	61,067
British Pound [Member]
Derivative [Line Items]
Total forward contracts notional amount	17,199	22,809
Malaysian Ringgit [Member]
Derivative [Line Items]
Total forward contracts notional amount	$ 17,681	$ 10,241