CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 72,103	$ 62,051
Accounts receivable, less allowances (2015 - $907; 2014 - $709)	91,252us-gaap_AccountsReceivableNetCurrent	84,366us-gaap_AccountsReceivableNetCurrent
Inventories	53,640us-gaap_InventoryNet	51,241us-gaap_InventoryNet
Taxes receivable	1,426us-gaap_IncomeTaxesReceivable	4,539us-gaap_IncomeTaxesReceivable
Prepaid expenses and other current assets	10,205	11,109
Total current assets	228,626us-gaap_AssetsCurrent	213,306us-gaap_AssetsCurrent
Property, plant and equipment, at cost	289,473us-gaap_PropertyPlantAndEquipmentGross	304,811us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(179,184)	(189,454)
Net, property, plant and equipment	110,289us-gaap_PropertyPlantAndEquipmentNet	115,357us-gaap_PropertyPlantAndEquipmentNet
Goodwill	16,796us-gaap_Goodwill	21,943us-gaap_Goodwill
Other intangible assets, net	7,323	7,841
Other assets, net	3,522us-gaap_OtherAssetsNoncurrent	3,323us-gaap_OtherAssetsNoncurrent
Total assets	366,556us-gaap_Assets	361,770us-gaap_Assets
Current liabilities:
Current portion of long-term debt	550us-gaap_LongTermDebtCurrent	615us-gaap_LongTermDebtCurrent
Accounts payable	48,488us-gaap_AccountsPayableCurrent	49,325us-gaap_AccountsPayableCurrent
Accrued payroll and other compensation	9,118	14,550
Accrued taxes	10,334us-gaap_TaxesPayableCurrent	1,447us-gaap_TaxesPayableCurrent
Other accrued liabilities	9,711us-gaap_OtherAccruedLiabilitiesCurrent	7,140us-gaap_OtherAccruedLiabilitiesCurrent
Total current liabilities	78,201us-gaap_LiabilitiesCurrent	73,077us-gaap_LiabilitiesCurrent
Long-term debt	40,146us-gaap_LongTermDebtNoncurrent	40,315us-gaap_LongTermDebtNoncurrent
Deferred tax liabilities	11,571	13,867
Benefit plan liabilities	18,966	19,142
Other long-term liabilities	2,681us-gaap_OtherLiabilitiesNoncurrent	2,770us-gaap_OtherLiabilitiesNoncurrent
Commitments and Contingencies
Stockholders’ equity:
Preferred stock	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock	2,460us-gaap_CommonStockValue	2,463us-gaap_CommonStockValue
Capital in excess of par value	70,402us-gaap_AdditionalPaidInCapital	68,961us-gaap_AdditionalPaidInCapital
Retained earnings	261,036	242,099
Accumulated other comprehensive loss	(33,943)	(24,161)
Treasury stock, at cost	(84,964)us-gaap_TreasuryStockValue	(76,763)us-gaap_TreasuryStockValue
Total stockholders’ equity	214,991us-gaap_StockholdersEquity	212,599us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity	$ 366,556	$ 361,770

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, netted by jurisdiction and classified as noncurrent.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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