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Derivative Financial Instruments (Summary Of Derivative Financial Instruments Notional Amounts On Outstanding Positions) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Total notional value $ 246,999 $ 224,680
Derivative fair value (122) (406)
Singapore Dollar [Member]    
Derivatives, Fair Value [Line Items]    
Total notional value 44,299 73,455
Derivative fair value (1,036) 364
Euro [Member]    
Derivatives, Fair Value [Line Items]    
Total notional value 26,207 37,718
Derivative fair value 342 (122)
Japanese Yen [Member]    
Derivatives, Fair Value [Line Items]    
Total notional value 39,860 30,688
Derivative fair value 578 (89)
South Korean Won [Member]    
Derivatives, Fair Value [Line Items]    
Total notional value 22,964 15,888
Derivative fair value 471 (134)
British Pound Sterling [Member]    
Derivatives, Fair Value [Line Items]    
Total notional value 48,318 13,233
Derivative fair value (114) 80
Other Currencies [Member]    
Derivatives, Fair Value [Line Items]    
Total notional value 65,351 53,698
Derivative fair value $ (363) $ (505)