Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 8,355	$ 21,309	$ 15,456
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation	10,661	10,153	8,565
(Credit) charge for asbestos litigation	(540)	0	19,980
Deferred income taxes	2,545	5,975	2,345
Pension and other postretirement benefits - expense in excess of contributions	10,074	607	1,563
Stock-based compensation	1,258	1,954	3,267
Equity losses in Chinese joint venture	1,594	502	479
Change in provisions for bad debts and inventories	346	(24)	186
Provision for warranties net of settlements	988	396	260
Excess tax benefits from the exercise of stock options	(16)	(47)	(681)
Provision for environmental liabilities	0	303	871
Other - net	(13)	438	684
Changes in assets/liabilities:
Receivables	5,188	(12,852)	(7,476)
Inventories	(1,101)	301	385
Other assets, including insurance receivable - asbestos	10,507	16,544	11,213
Accounts payable	(3,894)	(732)	4,204
Accrued payrolls and employee benefits	(1,209)	(582)	909
Other liabilities, including asbestos liability	(19,299)	(21,958)	(19,259)
Net cash flows provided by operating activities	25,444	22,287	42,951
Cash flows from investing activities:
Purchases of property, plant and equipment	(9,668)	(15,780)	(35,001)
Purchases of long-term marketable securities	(770)	(857)	(497)
Proceeds from sale of long-term marketable securities	694	776	454
Proceeds from U.K. government grant	373	484	226
Return of collateral for outstanding foreign currency exchange contracts	0	0	1,543
Other	2	5	112
Net cash flows used in investing activities	(9,369)	(15,372)	(33,163)
Cash flows from financing activities:
Dividends paid	(7,442)	(7,429)	(7,378)
Proceeds from the issuance of common stock	123	167	790
Excess tax benefits from the exercise of stock options	16	47	681
Net cash flows used in financing activities	(7,303)	(7,215)	(5,907)
Effect of exchange rate changes on cash and cash equivalents	229	167	(301)
Net increase (decrease) in cash and cash equivalents	9,001	(133)	3,580
Cash and cash equivalents at beginning of year	69,888	70,021	66,441
Cash and cash equivalents at end of year	78,889	69,888	70,021
Supplemental disclosures of cash flow information:
Income tax payments	4,462	5,711	8,362
Interest payments	246	316	324
Non-cash investing activities:
Purchases of property, plant and equipment in accounts payable	$ 710	$ 2,418	$ 2,201