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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, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net Sales	$ 169,260	$ 145,705	$ 130,264	$ 123,639	$ 105,139	$ 94,999	$ 96,329	$ 114,039	$ 568,868	$ 410,506	$ 495,635
Income (Loss) Before Income Taxes									120,981	43,027	68,714
Identifiable Assets	348,258				348,961				348,258	348,961	335,532
Depreciation									27,284	29,024	31,625
Payments to Acquire Property, Plant, and Equipment									24,229	20,296	10,541
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales									(22,254)	(18,425)	(22,946)
Firearms [Member]
Segment Reporting Information [Line Items]
Net Sales									565,863	406,326	490,607
Income (Loss) Before Income Taxes									120,732	40,814	70,311
Identifiable Assets	174,500				163,792				174,500	163,792	166,975
Depreciation									25,126	27,149	29,542
Payments to Acquire Property, Plant, and Equipment									19,253	19,570	9,689
Unaffiliated Castings [Member]
Segment Reporting Information [Line Items]
Net Sales									3,005	4,180	5,028
Income (Loss) Before Income Taxes									(1,000)	(797)	(2,240)
Identifiable Assets	11,959				11,332				11,959	11,332	10,850
Depreciation									2,158	1,875	2,083
Payments to Acquire Property, Plant, and Equipment									4,976	726	852
Unaffiliated Castings [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Sales									25,259	22,605	27,974
Unaffiliated Castings [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Net Sales									22,254	18,425	22,946
Corporate [Member]
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes									1,249	3,010	643
Identifiable Assets	$ 161,799				$ 173,837				$ 161,799	$ 173,837	$ 157,707

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