Derivative Instruments And Hedging Activities (Summary Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Total forward contracts notional amount	$ 301,437	$ 295,505
Chinese Yuan [Member]
Derivative [Line Items]
Total forward contracts notional amount	41,860	27,414
Euro [Member]
Derivative [Line Items]
Total forward contracts notional amount	137,059	123,522
Japanese Yen [Member]
Derivative [Line Items]
Total forward contracts notional amount	30,334	44,982
Hungarian Forint [Member]
Derivative [Line Items]
Total forward contracts notional amount	55,671	57,077
Malaysian Ringgit [Member]
Derivative [Line Items]
Total forward contracts notional amount	$ 36,513	$ 42,510