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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Income (loss) from continuing operations, net of tax $ 52,883us-gaap_IncomeLossFromContinuingOperations $ 37,659us-gaap_IncomeLossFromContinuingOperations $ 69,134us-gaap_IncomeLossFromContinuingOperations
Foreign currency translation adjustments (36,949)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 10,171us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 6,710us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Net unrealized gain (loss) (net of taxes of $1,555 in 2012) on marketable securities.     1,168us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Unrealized gain (loss) on derivative instruments held at year end (net of taxes of $50 in 2014, $110 in 2013 and $127 in 2012) (93)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (210)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (235)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Unrealized gain (loss) reclassified into earnings 209us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet 236us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet 270us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Actuarial net gain (loss) incurred in fiscal year (20,715)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax 32,749us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax (6,687)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Amortization of gain (loss) 3,904us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 2,482us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 3,760us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Amortization of prior service credit (cost) 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax 930us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax 8us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax
Other comprehensive income (loss) (53,644)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 46,358us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 4,994us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income (loss) from continuing operations (761)rog_ComprehensiveIncomeLossFromContinuingOperationsNetOfTaxAttributableToParent 84,017rog_ComprehensiveIncomeLossFromContinuingOperationsNetOfTaxAttributableToParent 74,128rog_ComprehensiveIncomeLossFromContinuingOperationsNetOfTaxAttributableToParent
Income (loss) from discontinued operations, net of income taxes 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 102us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (449)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Comprehensive (loss) income $ (761)us-gaap_ComprehensiveIncomeNetOfTax $ 84,119us-gaap_ComprehensiveIncomeNetOfTax $ 73,679us-gaap_ComprehensiveIncomeNetOfTax