CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities:
Net income (loss)	$ 52,883us-gaap_NetIncomeLoss	$ 37,761us-gaap_NetIncomeLoss	$ 68,685us-gaap_NetIncomeLoss
Loss (income) from discontinued operations	0	(102)	449
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Depreciation and amortization	26,268us-gaap_DepreciationAndAmortization	26,351us-gaap_DepreciationAndAmortization	27,130us-gaap_DepreciationAndAmortization
Stock-based compensation expense	7,533us-gaap_ShareBasedCompensation	5,393us-gaap_ShareBasedCompensation	5,153us-gaap_ShareBasedCompensation
Loss from long-term investments	0us-gaap_GainLossOnInvestments		3,245us-gaap_GainLossOnInvestments
Deferred income taxes	8,150us-gaap_DeferredIncomeTaxExpenseBenefit	5,634us-gaap_DeferredIncomeTaxExpenseBenefit	(58,253)us-gaap_DeferredIncomeTaxExpenseBenefit
Equity in income of unconsolidated joint ventures, net	(4,123)	(4,326)	(4,743)
Dividends received from unconsolidated joint ventures	3,849	5,162	6,553
Pension and postretirement benefits	1,976	5,118	13,579
Gain from the sale of property, plant and equipment	(69)	(7)	(1,404)
Impairment of assets/investments	0us-gaap_AssetImpairmentCharges	4,620us-gaap_AssetImpairmentCharges	539us-gaap_AssetImpairmentCharges
Changes in operating assets and liabilities excluding effects of acquisition and disposition of businesses:
Accounts receivable	(11,146)	(2,972)	(2,333)
Accounts receivable, joint ventures	958	245	(502)
Inventories	(5,240)us-gaap_IncreaseDecreaseInInventories	7,188us-gaap_IncreaseDecreaseInInventories	5,873us-gaap_IncreaseDecreaseInInventories
Pension contribution	(14,645)us-gaap_PensionContributions	(13,751)us-gaap_PensionContributions	(23,518)us-gaap_PensionContributions
Other current assets	1,063	639	(1,497)
Accounts payable and other accrued expenses	16,638	9,020	(3,461)
Other, net	1,112	(8,806)	4,872
Net cash provided by (used in) operating activities of continuing operations	85,207	77,167	40,367
Net cash provided by (used in) operating activities of discontinued operations		848	(328)
Net cash provided by (used in) operating activities	85,207	78,015	40,039
Investing Activities:
Capital expenditures	(28,755)	(16,859)	(23,774)
Proceeds from the sale of property, plant and equipment, net	69	7	2,804
Other investing activities	166	(127)	0
Redemptions of long-term investments	0	0	25,438
Acquisition of business, net of cash received		0	(3,100)
Net cash provided by (used in) investing activities of continuing operations	(28,520)	(16,979)	1,368
Net cash provided by (used in) investing activities of discontinued operations	0	0	0
Net cash provided by (used in) investing activities	(28,520)	(16,979)	1,368
Financing Activities:
Repayment of debt principal and long term lease obligation	(17,797)us-gaap_RepaymentsOfDebt	(21,206)us-gaap_RepaymentsOfDebt	(25,519)us-gaap_RepaymentsOfDebt
Proceeds from issuance of capital stock, net	20,513	32,426	17,007
Issuance of restricted stock	(1,542)	(1,297)	(752)
Proceeds from issuance of shares to employee stock purchase plan	693us-gaap_ProceedsFromStockPlans	734us-gaap_ProceedsFromStockPlans	809us-gaap_ProceedsFromStockPlans
Net cash provided by (used in) financing activities of continuing operations	1,867	10,657	(8,455)
Effect of exchange rate fluctuations on cash	(13,063)	5,328	2,183
Net increase (decrease) in cash and cash equivalents	45,491	77,021	35,135
Cash and cash equivalents at beginning of year	191,884	114,863	79,728
Cash and cash equivalents at end of year	$ 237,375	$ 191,884	$ 114,863

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.22)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 5

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 20

-Article 9

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- Definition

The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Name Accounting Standards Codification

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

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-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 25

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The cash inflow from the additional capital contribution to the entity.

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 9

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash inflow associated with the amount received from the stock plan during the period.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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No definition available.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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