Derivative Financial Instruments (Summary Of Derivative Financial Instruments Notional Amounts On Outstanding Positions) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Total notional value	$ 167,303	$ 194,582
Derivative fair value	(509)	(1,313)
Euro
Derivatives, Fair Value [Line Items]
Total notional value	35,271	34,959
Derivative fair value	116	(92)
Singapore Dollar
Derivatives, Fair Value [Line Items]
Total notional value	38,735	34,584
Derivative fair value	16	254
Japanese Yen
Derivatives, Fair Value [Line Items]
Total notional value	27,737	25,561
Derivative fair value	(732)	(178)
British Pound Sterling
Derivatives, Fair Value [Line Items]
Total notional value	9,952	22,185
Derivative fair value	145	183
South Korean Won
Derivatives, Fair Value [Line Items]
Total notional value	15,257	9,408
Derivative fair value	195	63
Other currencies
Derivatives, Fair Value [Line Items]
Total notional value	40,351	67,885
Derivative fair value	$ (249)	$ (1,543)