Retirement Plans (Schedule Of Net Benefit Costs) (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
United States
Defined Benefit Plan Disclosure
Interest cost	$ 155	$ 171
Expected return on plan assets	(213)	(178)
Recognized net actuarial loss	24	33
Net periodic pension (income) cost	(34)	26
Foreign Plan
Defined Benefit Plan Disclosure
Interest cost	53	55
Expected return on plan assets	(72)	(65)
Amortization of prior service costs and transition amount	5	4
Recognized net actuarial loss	49	69
Net periodic pension (income) cost	$ 35	$ 63