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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net earnings	$ 8,948us-gaap_NetIncomeLoss	$ 11,725us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(3,074)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(590)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Amortization of:
Prior service benefit	(29)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	(754)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
Unrecognized loss	618us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	592us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Foreign currency exchange rate changes	8smp_ForeignCurrencyExchangeRateChanges	(22)smp_ForeignCurrencyExchangeRateChanges
Income tax (expense) benefit related to pension and postretirement plans	(241)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	58us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent
Pension and postretirement plans, net of tax	356us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	(126)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
Total other comprehensive income (loss), net of tax	(2,718)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(716)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income	$ 6,230us-gaap_ComprehensiveIncomeNetOfTax	$ 11,009us-gaap_ComprehensiveIncomeNetOfTax

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