Derivative Financial Instruments (Summary Of Derivative Financial Instruments Notional Amounts On Outstanding Positions) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Total notional value	$ 196,416	$ 194,582
Derivative fair value	50	(1,313)
Euro
Derivatives, Fair Value [Line Items]
Total notional value	62,796	34,959
Derivative fair value	(16)	(92)
Singapore Dollar
Derivatives, Fair Value [Line Items]
Total notional value	38,274	34,584
Derivative fair value	(54)	254
Japanese Yen
Derivatives, Fair Value [Line Items]
Total notional value	26,188	25,561
Derivative fair value	477	(178)
British Pound Sterling
Derivatives, Fair Value [Line Items]
Total notional value	7,478	22,185
Derivative fair value	(111)	183
South Korean Won
Derivatives, Fair Value [Line Items]
Total notional value	15,838	9,408
Derivative fair value	137	63
Other currencies
Derivatives, Fair Value [Line Items]
Total notional value	45,842	67,885
Derivative fair value	$ (383)	$ (1,543)