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Debt (Fixed Charge Metrics) (Details)
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Debt Disclosure [Abstract]          
Covenant Limit 1.75rog_CovenantRequirementFixedChargeCoverageRatio 1.75rog_CovenantRequirementFixedChargeCoverageRatio 1.75rog_CovenantRequirementFixedChargeCoverageRatio 1.75rog_CovenantRequirementFixedChargeCoverageRatio 1.75rog_CovenantRequirementFixedChargeCoverageRatio
Actual FCCR 2.36rog_FixedChargeCoverageRatioActual 2.58rog_FixedChargeCoverageRatioActual 2.70rog_FixedChargeCoverageRatioActual 2.65rog_FixedChargeCoverageRatioActual 2.69rog_FixedChargeCoverageRatioActual