Derivative Instruments And Hedging Activities (Summary Of Notional Amounts Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Total forward contracts notional amount	$ 199,113	$ 139,624
Euro [Member]
Derivative [Line Items]
Total forward contracts notional amount	97,198	75,886
Japanese Yen [Member]
Derivative [Line Items]
Total forward contracts notional amount	7,798	23,284
Hungarian Forint [Member]
Derivative [Line Items]
Total forward contracts notional amount	61,067	21,159
British Pound [Member]
Derivative [Line Items]
Total forward contracts notional amount	22,809	14,869
Malaysian Ringgit [Member]
Derivative [Line Items]
Total forward contracts notional amount	$ 10,241	$ 4,426