Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net (loss) income	$ (11,302)	$ (79,809)	$ 1,373
Adjustments to reconcile net (loss) income to net cash flows from operating activities:
Depreciation and amortization	22,387	20,463	11,787
Charges for impairment	0	26,676	0
Charge for asbestos litigation	0	5,631	0
Deferred income tax provision (benefit), including valuation allowance	3,177	23,407	(2,302)
Difference between pension and other postretirement expense and contributions	(1,857)	(1,948)	4,972
Stock-based compensation	2,400	2,332	1,328
Equity (gains) losses in joint venture, including gain on sale (Note 3)	(1,036)	(423)	514
Provisions for bad debts and inventories	305	2,348	862
Provision for warranties net of settlements	(413)	(1,015)	(159)
Loss on disposition of assets	401	21	378
Gain on sale of long-term marketable securities	0	(1,404)	0
Other – net	1,569	(279)	577
Changes in assets/liabilities:
Receivables	(12,916)	5,697	9,391
Inventories	(20,359)	8,308	(4,527)
Other assets, including insurance receivable – asbestos	19,351	20,466	15,300
Accounts payable	7,818	(8,819)	(3,003)
Accrued payrolls and employee benefits	1,101	1,051	452
Other liabilities, including asbestos liability	(26,465)	(28,337)	(16,438)
Net cash flows (used in) provided by operating activities	(15,839)	(5,634)	20,505
Cash flows from investing activities:
Purchases of property, plant and equipment	(14,899)	(10,566)	(9,407)
Purchase of Åkers AB, net of cash acquired (Note 2)	0	(27,031)	0
Purchase of ASW Steel Inc., net of cash acquired (Note 2)	0	(3,265)	0
Purchase of Alloys Unlimited & Processing, Inc. (Note 2)	0	0	(5,000)
Proceeds from sale of investment in joint venture (Note 3)	1,500	0	0
Purchases of long-term marketable securities	(109)	(4,662)	(631)
Proceeds from sale of long-term marketable securities	327	4,646	728
Other	0	0	11
Net cash flows used in investing activities	(13,181)	(40,878)	(14,299)
Cash flows from financing activities:
Dividends paid	(2,236)	(5,206)	(7,512)
Debt issuance costs (Note 8)	0	(1,247)	0
Repayment of debt	(1,318)	(962)	0
Proceeds from Revolving Credit and Security Agreement (Note 8)	25,349	0	0
Payments on Revolving Credit and Security Agreement (Note 8)	(5,000)	0	0
Proceeds from ASW credit facility (Note 8)	8,795	9,756	0
Payments on ASW credit facility (Note 8)	(15,941)	(11,217)	0
Net cash flows provided by (used in) financing activities	9,649	(8,876)	(7,512)
Effect of exchange rate changes on cash and cash equivalents	1,492	(1,155)	(670)
Net decrease in cash and cash equivalents	(17,879)	(56,543)	(1,976)
Cash and cash equivalents at beginning of year	38,579	95,122	97,098
Cash and cash equivalents at end of year	20,700	38,579	95,122
Supplemental disclosures of cash flow information:
Income tax payments	844	4,404	3,247
Interest payments	1,283	957	225
Non-cash investing activities:
Purchases of property, plant and equipment in accounts payable	1,068	996	329
Non-cash financing activities:
Issuance of common stock to acquire net assets of Åkers (Note 2)	0	22,137	0
Issuance of debt to acquire net assets of Åkers (Note 2)	$ 0	$ 22,619	$ 0