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Contingent Liabilities (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loss Contingencies [Line Items]      
Number of lawsuits against the company 3us-gaap_LossContingencyPendingClaimsNumber 5us-gaap_LossContingencyPendingClaimsNumber  
Minimum limit of per claim for providing insurance coverage on annual basis $ 5,000,000rgr_ThresholdLimitOfLossesPerTransactionForTakingInsuranceCoverageOnAnnualBasis    
Maximum limit of aggregate loss incurred annually for providing insurance coverage on annual basis 10,000,000rgr_ThresholdLimitOfAggregateLossForInsuranceCoverageOnAnnualBasisExcludingNewClaimsFromGovernmentsOrMunicipalities    
Total amount of damages claimed        
Total Product Liability Expense $ 774,000us-gaap_ProductLiabilityAccrualPeriodExpense $ 1,253,000us-gaap_ProductLiabilityAccrualPeriodExpense $ 177,000us-gaap_ProductLiabilityAccrualPeriodExpense