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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 28, 2015	Dec. 31, 2014
Current Assets
Cash	$ 30,800us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 8,901us-gaap_CashAndCashEquivalentsAtCarryingValue
Trade receivables, net	63,031us-gaap_AccountsReceivableNetCurrent	49,735us-gaap_AccountsReceivableNetCurrent
Gross inventories	73,261us-gaap_InventoryGross	89,017us-gaap_InventoryGross
Less LIFO reserve	(41,041)us-gaap_InventoryLIFOReserve	(40,578)us-gaap_InventoryLIFOReserve
Less excess and obsolescence reserve	(2,928)us-gaap_InventoryValuationReserves	(3,750)us-gaap_InventoryValuationReserves
Net inventories	29,292us-gaap_InventoryNet	44,689us-gaap_InventoryNet
Deferred income taxes	7,975us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent	7,246us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Prepaid expenses and other current assets	2,518us-gaap_PrepaidExpenseAndOtherAssetsCurrent	7,603us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total Current Assets	133,616us-gaap_AssetsCurrent	118,174us-gaap_AssetsCurrent
Property, plant and equipment	292,321us-gaap_PropertyPlantAndEquipmentGross	288,236us-gaap_PropertyPlantAndEquipmentGross
Less allowances for depreciation	(186,181)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(177,575)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property, plant and equipment	106,140us-gaap_PropertyPlantAndEquipmentNet	110,661us-gaap_PropertyPlantAndEquipmentNet
Other assets	27,887us-gaap_OtherAssetsNoncurrent	25,547us-gaap_OtherAssetsNoncurrent
Total Assets	267,643us-gaap_Assets	254,382us-gaap_Assets
Current Liabilities
Trade accounts payable and accrued expenses	33,071us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent	36,150us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Product liability	370rgr_ProductLiabilityCurrent	641rgr_ProductLiabilityCurrent
Employee compensation and benefits	20,805us-gaap_EmployeeRelatedLiabilitiesCurrent	18,302us-gaap_EmployeeRelatedLiabilitiesCurrent
Workers' compensation	5,522us-gaap_WorkersCompensationLiabilityCurrent	5,133us-gaap_WorkersCompensationLiabilityCurrent
Income taxes payable	3,237us-gaap_AccruedIncomeTaxesCurrent	156us-gaap_AccruedIncomeTaxesCurrent
Total Current Liabilities	63,005us-gaap_LiabilitiesCurrent	60,382us-gaap_LiabilitiesCurrent
Product liability	125rgr_ProductLiabilityAccrualNoncurrent	204rgr_ProductLiabilityAccrualNoncurrent
Deferred income taxes	9,066us-gaap_DeferredIncomeTaxLiabilities	8,334us-gaap_DeferredIncomeTaxLiabilities
Contingent liabilities - Note 10
Stockholders' Equity
Additional paid-in capital	25,962us-gaap_AdditionalPaidInCapitalCommonStock	25,472us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings	210,457us-gaap_RetainedEarningsAccumulatedDeficit	198,159us-gaap_RetainedEarningsAccumulatedDeficit
Less: Treasury stock - at cost 2015 - 5,062,347 shares - 2014 - 4,980,247 shares	(64,727)us-gaap_TreasuryStockValue	(61,886)us-gaap_TreasuryStockValue
Total Stockholders' Equity	195,447us-gaap_StockholdersEquity	185,462us-gaap_StockholdersEquity
Total Liabilities and Stockholders' Equity	267,643us-gaap_LiabilitiesAndStockholdersEquity	254,382us-gaap_LiabilitiesAndStockholdersEquity
Nonvoting Common Stock [Member]
Stockholders' Equity
Common Stock
Voting Common Stock [Member]
Stockholders' Equity
Common Stock	$ 23,755us-gaap_CommonStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	$ 23,717us-gaap_CommonStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember

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Carrying value as of the balance sheet date of obligations incurred through that date which includes the cost of outside legal fees, insurance, and other expenses incurred in the management and defense of product liability matters and due after one year (or beyond the operating cycle if longer).

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