Business Segments (Schedule Of Reporting Sements Net Profit Reconcilation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Business Segments [Abstract]
Income for reportable segments	$ 14,962	$ 15,688	$ 17,306	$ 30,200
Cost of capital for reportable segments	3,897	3,901	12,866	11,108
Interest expense	(141)	(170)	(405)	(443)
Interest income	126	74	319	224
Other (expense)/income	(329)	650	453	822
LIFO income/(expense)	432	(444)	333	(1,140)
Equity in income of nonconsolidated investment	310	287	643	570
(Loss)/Gain on foreign exchange	(283)	711	(457)	497
Corporate expense and other unallocated charges	(5,863)	(7,038)	(18,044)	(18,275)
(Loss) income from continuing operations before income taxes	$ 13,111	$ 13,659	$ 13,014	$ 23,563