Derivative Financial Instruments (Summary Of Derivative Financial Instruments Notional Amounts On Outstanding Positions) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Total notional value	$ 328,221	$ 194,391
Fair value of notional amount	(157)	(55)
Singapore Dollar [Member]
Derivatives, Fair Value [Line Items]
Total notional value	94,763	0
Fair value of notional amount	(2,611)	0
Japanese Yen [Member]
Derivatives, Fair Value [Line Items]
Total notional value	87,171	98,390
Fair value of notional amount	4,180	0
Euro [Member]
Derivatives, Fair Value [Line Items]
Total notional value	71,228	34,219
Fair value of notional amount	(1,441)	0
British Pound Sterling [Member]
Derivatives, Fair Value [Line Items]
Total notional value	14,332	21,859
Fair value of notional amount	(660)	0
Other [Member]
Derivatives, Fair Value [Line Items]
Total notional value	60,727	39,923
Fair value of notional amount	$ 375	$ (55)