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Operating Segment Information (Schedule of Operating Segment Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2016	Oct. 03, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net Sales	$ 118,230	$ 104,817	$ 131,854	$ 167,355	$ 161,848	$ 161,427	$ 167,944	$ 173,109	$ 522,256	$ 664,328	$ 551,094
Income (Loss) Before Income Taxes									77,646	135,921	96,100
Identifiable Assets	284,318				346,879				284,318	346,879	315,883
Depreciation									33,819	34,698	35,438
Payments to Acquire Property, Plant, and Equipment									33,596	35,215	28,705
Firearms [Member]
Segment Reporting Information [Line Items]
Net Sales									517,701	658,433	544,850
Income (Loss) Before Income Taxes									77,368	136,390	98,565
Identifiable Assets	206,091				242,758				206,091	242,758	221,670
Depreciation									31,701	32,010	32,409
Payments to Acquire Property, Plant, and Equipment									32,710	33,455	26,246
Unaffiliated Castings [Member]
Segment Reporting Information [Line Items]
Net Sales									4,555	5,895	6,244
Income (Loss) Before Income Taxes									(53)	(1,237)	(3,407)
Identifiable Assets	12,524				16,096				12,524	16,096	15,289
Depreciation									2,118	2,688	3,029
Payments to Acquire Property, Plant, and Equipment									886	1,760	2,459
Corporate [Member]
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes									331	768	942
Identifiable Assets	$ 65,703				$ 88,025				65,703	88,025	78,924
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales									(24,436)	(36,779)	(31,585)
Intersegment Elimination [Member] | Unaffiliated Castings [Member]
Segment Reporting Information [Line Items]
Net Sales									24,436	36,779	31,585
Operating Segments [Member] | Unaffiliated Castings [Member]
Segment Reporting Information [Line Items]
Net Sales									$ 28,991	$ 42,674	$ 37,829

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