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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income $ 36,141us-gaap_NetIncomeLoss $ 30,104us-gaap_NetIncomeLoss $ 28,203us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 14,615us-gaap_DepreciationDepletionAndAmortization 13,588us-gaap_DepreciationDepletionAndAmortization 12,066us-gaap_DepreciationDepletionAndAmortization
Pension expense 2,708us-gaap_PensionExpense 7,164us-gaap_PensionExpense 6,946us-gaap_PensionExpense
Contributions to pension plan (2,500)us-gaap_PensionContributions (4,200)us-gaap_PensionContributions (7,200)us-gaap_PensionContributions
Deferred income taxes (1,367)us-gaap_DeferredIncomeTaxExpenseBenefit 241us-gaap_DeferredIncomeTaxExpenseBenefit 2,193us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on sale of property, plant and equipment (343)us-gaap_GainLossOnDispositionOfAssets (2,535)us-gaap_GainLossOnDispositionOfAssets  
Changes in operating assets and liabilities, net of effect of acquisitions:      
Accounts receivable - net (8,529)us-gaap_IncreaseDecreaseInReceivables (662)us-gaap_IncreaseDecreaseInReceivables 710us-gaap_IncreaseDecreaseInReceivables
Inventories - net (2,987)us-gaap_IncreaseDecreaseInInventories (48)us-gaap_IncreaseDecreaseInInventories (8,583)us-gaap_IncreaseDecreaseInInventories
Accounts payable (693)us-gaap_IncreaseDecreaseInAccountsPayable 2,985us-gaap_IncreaseDecreaseInAccountsPayable (1,911)us-gaap_IncreaseDecreaseInAccountsPayable
Commissions payable 3,367us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (1,487)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (189)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Deferred revenue (3,024)us-gaap_IncreaseDecreaseInDeferredRevenue 7,112us-gaap_IncreaseDecreaseInDeferredRevenue  
Accrued expenses (3,700)us-gaap_IncreaseDecreaseInAccruedLiabilities 6,947us-gaap_IncreaseDecreaseInAccruedLiabilities 4,727us-gaap_IncreaseDecreaseInAccruedLiabilities
Benefit obligations and other (4,685)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (8,823)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (4,329)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities 29,003us-gaap_NetCashProvidedByUsedInOperatingActivities 50,386us-gaap_NetCashProvidedByUsedInOperatingActivities 32,633us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Capital additions - net (13,275)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (21,015)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (16,373)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of property, plant and equipment 681us-gaap_ProceedsFromSaleOfMachineryAndEquipment 2,905us-gaap_ProceedsFromSaleOfMachineryAndEquipment  
(Purchases) redemptions of short-term investments (3)us-gaap_PaymentsToAcquireShortTermInvestments 1us-gaap_PaymentsToAcquireShortTermInvestments 805us-gaap_PaymentsToAcquireShortTermInvestments
Payments for acquisitions, net of cash acquired (16,667)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired   (20,823)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Net cash used for investing activities (29,264)us-gaap_NetCashProvidedByUsedInInvestingActivities (18,109)us-gaap_NetCashProvidedByUsedInInvestingActivities (36,391)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Cash dividends (9,715)us-gaap_DividendsCash (8,662)us-gaap_DividendsCash (8,188)us-gaap_DividendsCash
Proceeds from bank borrowings 18,000us-gaap_ProceedsFromBankDebt 6,000us-gaap_ProceedsFromBankDebt 17,000us-gaap_ProceedsFromBankDebt
Payments to bank for borrowings (15,000)us-gaap_RepaymentsOfBankDebt (19,000)us-gaap_RepaymentsOfBankDebt (5,000)us-gaap_RepaymentsOfBankDebt
Net cash (used for) provided by financing activities (6,715)us-gaap_NetCashProvidedByUsedInFinancingActivities (21,662)us-gaap_NetCashProvidedByUsedInFinancingActivities 3,812us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash 344us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 389us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (77)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net (decrease) increase in cash and cash equivalents (6,632)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 11,004us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (23)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents:      
Beginning of year 31,123us-gaap_CashAndCashEquivalentsAtCarryingValue 20,119us-gaap_CashAndCashEquivalentsAtCarryingValue 20,142us-gaap_CashAndCashEquivalentsAtCarryingValue
End of year $ 24,491us-gaap_CashAndCashEquivalentsAtCarryingValue $ 31,123us-gaap_CashAndCashEquivalentsAtCarryingValue $ 20,119us-gaap_CashAndCashEquivalentsAtCarryingValue