CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities:
Net income (loss)	$ 7,096	$ (1,808)
Income (loss) from discontinued operations, net of income taxes	(120)	222
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	6,571	6,509
Stock-based compensation expense	688	1,442
Loss from long-term investments		3,245
Deferred income taxes	281	(2,134)
Equity in undistributed income of unconsolidated joint ventures, net	(529)	(657)
Dividends received from unconsolidated joint ventures	1,988	2,929
Pension and postretirement benefits	2,434	4,936
Gain from the sale of property, plant and equipment	(74)
Impairment of assets		539
Changes in operating assets and liabilities excluding effects of acquisition and disposition of businesses:
Accounts receivable	1,194	326
Accounts receivable, joint ventures	(233)	(87)
Inventories	2,829	(2,406)
Pension contribution	(6,500)	(10,000)
Other current assets	510	(2,946)
Accounts payable and other accrued expenses	2,139	(2,498)
Other, net	950	619
Net cash provided by (used in) operating activities of continuing operations	19,224	(1,769)
Net cash provided by (used in) operating activites of discontinued operations	726	(257)
Net cash provided by (used in) operating activites	19,950	(2,026)
Investing Activities:
Capital expenditures	(7,706)	(4,181)
Proceeds from short-term investments		25,438
Proceeds from the sale of property, plant and equipment, net	74
Deferred purchase price for previous acquisition of business		(3,100)
Net cash provided by (used in) investing activities of continuing operations	(7,632)	18,157
Financing Activities:
Repayment of debt principal and long term lease obligation	(2,758)	(1,500)
Proceeds from sale of capital stock, net	3,420	112
Issuance of restricted stock shares	(1,005)
Proceeds from issuance of shares to employee stock purchase plan	390	412
Net cash provided by (used in) financing activities of continuing operations	47	(976)
Effect of exchange rate fluctuations on cash	(814)	(1,366)
Net increase (decrease) in cash and cash equivalents	11,551	13,789
Cash and cash equivalents at beginning of year	114,863	79,728
Cash and cash equivalents at end of quarter	$ 126,414	$ 93,517