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Derivative Financial Instruments (Summary Of Derivative Financial Instruments Notional Amounts On Outstanding Positions) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Total notional value $ 194,582 $ 224,680
Derivative fair value (1,313) (406)
Euro    
Derivatives, Fair Value [Line Items]    
Total notional value 34,959 37,718
Derivative fair value (92) (122)
Singapore Dollar    
Derivatives, Fair Value [Line Items]    
Total notional value 34,584 73,455
Derivative fair value 254 364
Japanese Yen    
Derivatives, Fair Value [Line Items]    
Total notional value 25,561 30,688
Derivative fair value (178) (89)
British Pound Sterling    
Derivatives, Fair Value [Line Items]    
Total notional value 22,185 13,233
Derivative fair value 183 80
South Korean Won    
Derivatives, Fair Value [Line Items]    
Total notional value 9,408 15,888
Derivative fair value 63 (134)
Other currencies    
Derivatives, Fair Value [Line Items]    
Total notional value 67,885 53,698
Derivative fair value $ (1,543) $ (505)