Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Operations [Abstract]
Net sales	$ 292,905	$ 344,816	$ 326,886
Operating costs and expenses:
Costs of products sold (excluding depreciation)	225,906	256,030	229,528
Selling and administrative	40,530	41,887	44,168
Depreciation	10,661	10,153	8,565
(Credit) charge for asbestos litigation	(540)	0	19,980
Loss (gain) on disposition of assets	56	272	(82)
Total operating expenses	276,613	308,342	302,159
Income from operations	16,292	36,474	24,727
Other income (expense):
Investment-related income	63	146	1,183
Interest expense	(246)	(315)	(324)
Other - net	(942)	(1,578)	(964)
Total other income (expense)	(1,125)	(1,747)	(105)
Income before income taxes and equity losses in Chinese joint venture	15,167	34,727	24,622
Income tax provision	(5,218)	(12,916)	(8,687)
Equity losses in Chinese joint venture	(1,594)	(502)	(479)
Net income	$ 8,355	$ 21,309	$ 15,456
Net income per common share:
Basic	$ 0.81	$ 2.07	$ 1.51
Diluted	$ 0.80	$ 2.05	$ 1.50
Weighted average number of common shares outstanding:
Basic	10,338	10,319	10,254
Diluted	10,390	10,393	10,291