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Segment Reporting Schedule of Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Sales	$ 174,966	$ 159,459	$ 527,189	$ 515,504
Aluminum Extrusions [Member]
Disaggregation of Revenue [Line Items]
Sales	115,717	109,410	349,353	364,607
Aluminum Extrusions [Member] | Nonresidential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	61,988	59,476	195,603	203,889
Aluminum Extrusions [Member] | Consumer Durables [Member]
Disaggregation of Revenue [Line Items]
Sales	8,581	8,662	25,487	30,723
Aluminum Extrusions [Member] | Automotive [Member]
Disaggregation of Revenue [Line Items]
Sales	11,060	13,025	31,793	36,916
Aluminum Extrusions [Member] | Residential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	9,790	7,999	27,575	29,658
Aluminum Extrusions [Member] | Electrical [Member]
Disaggregation of Revenue [Line Items]
Sales	8,926	2,016	21,983	16,223
Aluminum Extrusions [Member] | Machinery and Equipment BNL [Domain]
Disaggregation of Revenue [Line Items]
Sales	13,131	14,202	37,995	36,008
Aluminum Extrusions [Member] | Distribution [Member]
Disaggregation of Revenue [Line Items]
Sales	2,241	4,030	8,917	11,190
Aluminum Extrusions [Member] | Aluminum Extrusions Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	115,717	109,410	349,353	364,607
PE Films [Member]
Disaggregation of Revenue [Line Items]
Sales	24,879	19,938	78,811	56,036
PE Films [Member] | Surface Protection Films [Member]
Disaggregation of Revenue [Line Items]
Sales	17,516	12,755	56,241	34,251
PE Films [Member] | Personal Care Materials
Disaggregation of Revenue [Line Items]
Sales	7,363	7,183	22,570	21,785
PE Films [Member] | Film Products Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	24,879	19,938	78,811	56,036
Flexible Packaging Films [Member] [Domain]
Disaggregation of Revenue [Line Items]
Sales	34,370	30,111	99,025	94,861
UNITED STATES
Disaggregation of Revenue [Line Items]
Sales	133,157	125,407	407,465	409,433
Asia [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	11,875	7,873	34,534	19,082
Revenues	6,500	4,800	19,100	11,700
Asia [Member] | Operations Outside United States [Member]
Disaggregation of Revenue [Line Items]
Sales	289	142	555	302
Latin America [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	1,395	1,764	4,121	5,440
CANADA | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	3,437	3,640	10,459	12,879
Europe [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	405	282	1,053	1,414
Brazil | Operations Outside United States [Member]
Disaggregation of Revenue [Line Items]
Sales	$ 24,408	$ 20,351	$ 69,002	$ 66,954

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