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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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