Retirement Plans (Schedule Of Net Benefit Costs) (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
United States
Defined Benefit Plan Disclosure
Interest cost	$ 155	$ 171	$ 311	$ 342
Expected return on plan assets	(213)	(178)	(427)	(355)
Recognized net actuarial loss	24	33	48	65
Net periodic pension (income) cost	(34)	26	(68)	52
Foreign Plan
Defined Benefit Plan Disclosure
Interest cost	52	55	104	110
Expected return on plan assets	(71)	(66)	(142)	(132)
Amortization of prior service costs and transition amount	5	4	10	8
Recognized net actuarial loss	49	71	98	142
Net periodic pension (income) cost	$ 35	$ 64	$ 70	$ 128