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

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- Definition Represents maximum limit of aggregate loss incurred annually for providing insurance coverage on annual basis excluding for certain new claims from governments or municipalities. + References No definition available. + Details
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- Definition Represents minimum limit of per claim for providing insurance coverage on annual basis. + References No definition available. + Details
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- Details
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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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- Definition The amount of loss reported during the period pertaining to product liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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