CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Activities:
Net income (loss)	$ 68,685	$ 37,055	$ 34,571
Loss (earnings) from discontinued operations	449	7,195	3,980
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	27,130	26,308	15,700
Stock-based compensation expense	5,153	8,096	6,628
Loss from long-term investments	3,245		0
Deferred income taxes	(58,253)	(2,725)	(8,381)
Equity in undistributed income of unconsolidated joint ventures, net	(4,743)	(5,451)	(8,658)
Dividends received from unconsolidated joint ventures	6,553	7,637	10,329
Pension and postretirement benefits	13,579	5,902	5,838
Gain from the sale of property, plant and equipment	(1,404)	(2,800)	(3,173)
Impairment of assets	539	441	0
Amortization of inventory fair value		1,805	0
Changes in operating assets and liabilities excluding effects of acquisition and disposition of businesses:
Accounts receivable	(2,333)	(5,051)	(15,694)
Accounts receivable, joint ventures	(502)	(302)	(537)
Inventories	5,873	(20,628)	(10,752)
Pension contribution	(23,518)	(5,904)	(6,409)
Other current assets	(1,497)	(1,336)	(1,566)
Accounts payable and other accrued expenses	(3,461)	(27,229)	21,314
Other, net	4,872	(929)	6,163
Net cash provided by (used in) operating activities of continuing operations	40,367	22,084	49,353
Net cash provided by (used in) operating activites of discontinued operations	(328)	(5,223)	(3,588)
Net cash provided by (used in) operating activites	40,039	16,861	45,765
Investing Activities:
Capital expenditures	(23,774)	(21,316)	(12,241)
Proceeds from short-term investments	25,438
Proceeds from the sale of property, plant and equipment, net	2,804	7,500	0
Return of investment in unconsolidated joint ventures	0	0	919
Proceeds from disposition of an unconsolidated joint venture	0	0	9,272
Redemptions of long-term investments			5,800
Acquisition of business, net of cash received	(3,100)	(139,825)	(25,908)
Net cash provided by (used in) investing activities of continuing operations	1,368	(145,836)	(22,158)
Cash Provided by (Used in) Investing Activities, Discontinued Operations	0	(158)	(366)
Net cash provided by (used in) investing activities	1,368	(145,994)	(22,524)
Financing Activities:
Proceeds from long term borrowings		145,000	0
Repayment of debt principal and long term lease obligation	(25,519)	(22,500)	0
Payment of long term borrowings acquired through acquisition		(6,061)	0
Proceeds from sale of capital stock, net	17,007	11,071	790
Issuance of restricted stock shares	(752)	0	0
Proceeds from issuance of shares to employee stock purchase plan	809	756	686
Net cash provided by (used in) financing activities of continuing operations	(8,455)	128,266	1,476
Effect of exchange rate fluctuations on cash	2,183	460	(2,320)
Net increase (decrease) in cash and cash equivalents	35,135	(407)	22,397
Cash and cash equivalents at beginning of year	79,728	80,135	57,738
Cash and cash equivalents at end of quarter	114,863	79,728	80,135
Supplemental disclosure of noncash investing and financing activities
Capital lease obligation acquired through acquisition		9,206	0
Supplemental Deferred Purchase Price	$ 0	$ 0	$ 2,910