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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	$ 8,589us-gaap_NetIncomeLoss	$ 32,265us-gaap_NetIncomeLoss	$ 14,911us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,613us-gaap_DepreciationDepletionAndAmortization	21,450us-gaap_DepreciationDepletionAndAmortization	19,415us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation expense	3,319us-gaap_ShareBasedCompensation	3,323us-gaap_ShareBasedCompensation	2,553us-gaap_ShareBasedCompensation
Tax benefit from stock-based plans	(896)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	(1,754)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	(289)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Deferred income taxes	4,800us-gaap_DeferredIncomeTaxExpenseBenefit	(652)us-gaap_DeferredIncomeTaxExpenseBenefit	(2,209)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for doubtful accounts	257us-gaap_ProvisionForDoubtfulAccounts	120us-gaap_ProvisionForDoubtfulAccounts	165us-gaap_ProvisionForDoubtfulAccounts
Pension settlement expense	21,623us-gaap_PensionExpense	0us-gaap_PensionExpense	0us-gaap_PensionExpense
Other	641us-gaap_OtherNoncashIncomeExpense	459us-gaap_OtherNoncashIncomeExpense	614us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Accounts receivable	870us-gaap_IncreaseDecreaseInAccountsReceivable	1,400us-gaap_IncreaseDecreaseInAccountsReceivable	1,210us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories	(15,656)us-gaap_IncreaseDecreaseInInventories	5,419us-gaap_IncreaseDecreaseInInventories	(3,458)us-gaap_IncreaseDecreaseInInventories
Customer deposits	4,679us-gaap_IncreaseDecreaseInCustomerDeposits	(1,955)us-gaap_IncreaseDecreaseInCustomerDeposits	6,391us-gaap_IncreaseDecreaseInCustomerDeposits
Other assets and liabilities	(2,023)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet	(2,638)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet	1,819us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Accounts payable and accrued liabilities	6,638us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	(1,548)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	11,046us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
NET CASH PROVIDED BY OPERATING ACTIVITIES	55,454us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	55,889us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	52,168us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(30,882)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	(20,202)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	(25,014)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of certificates of deposit	(10,000)us-gaap_PaymentsToAcquireRestrictedCertificatesOfDeposit	0us-gaap_PaymentsToAcquireRestrictedCertificatesOfDeposit	0us-gaap_PaymentsToAcquireRestrictedCertificatesOfDeposit
Restricted cash and cash equivalents	(1,001)us-gaap_IncreaseDecreaseInRestrictedCash	(3)us-gaap_IncreaseDecreaseInRestrictedCash	(200)us-gaap_IncreaseDecreaseInRestrictedCash
Other investing activities	511us-gaap_PaymentsForProceedsFromOtherInvestingActivities	85us-gaap_PaymentsForProceedsFromOtherInvestingActivities	448us-gaap_PaymentsForProceedsFromOtherInvestingActivities
NET CASH USED IN INVESTING ACTIVITIES	(41,372)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(20,120)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(24,766)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from borrowings under revolving credit facilities	0us-gaap_ProceedsFromLinesOfCredit	0us-gaap_ProceedsFromLinesOfCredit	0us-gaap_ProceedsFromLinesOfCredit
Payments of borrowings under revolving credit facilities	0us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit
Net change in borrowings under revolving credit facilities	0us-gaap_ProceedsFromRepaymentsOfLinesOfCredit	0us-gaap_ProceedsFromRepaymentsOfLinesOfCredit	0us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
Payments on lease obligations	(1,088)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations	(867)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations	(766)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Proceeds from exercise of stock options	0us-gaap_ProceedsFromStockOptionsExercised	872us-gaap_ProceedsFromStockOptionsExercised	2,457us-gaap_ProceedsFromStockOptionsExercised
Tax benefit from stock-based plans	896us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	1,754us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	289us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Dividends paid	(29,780)us-gaap_PaymentsOfDividendsCommonStock	(5,353)us-gaap_PaymentsOfDividendsCommonStock	(24,684)us-gaap_PaymentsOfDividendsCommonStock
Common stock repurchased and retired	(804)us-gaap_StockRepurchasedDuringPeriodValue	0us-gaap_StockRepurchasedDuringPeriodValue	(218)us-gaap_StockRepurchasedDuringPeriodValue
Other financing activities	(1,010)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities	(2,540)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities	(515)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
NET CASH USED IN FINANCING ACTIVITIES	(31,786)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	(6,134)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	(23,437)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(17,704)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	29,635us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	3,965us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	83,185us-gaap_CashAndCashEquivalentsAtCarryingValue	53,550us-gaap_CashAndCashEquivalentsAtCarryingValue	49,585us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 65,481us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 83,185us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 53,550us-gaap_CashAndCashEquivalentsAtCarryingValue

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