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Segment Reporting Schedule of Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Sales	$ 170,968	$ 263,327	$ 356,046	$ 491,811
Aluminum Extrusions [Member]
Disaggregation of Revenue [Line Items]
Sales	121,827	190,308	255,197	348,417
Aluminum Extrusions [Member] | Nonresidential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	65,784	99,302	144,413	180,223
Aluminum Extrusions [Member] | Consumer Durables [Member]
Disaggregation of Revenue [Line Items]
Sales	11,714	18,805	22,061	35,695
Aluminum Extrusions [Member] | Automotive [Member]
Disaggregation of Revenue [Line Items]
Sales	11,769	14,473	23,891	28,314
Aluminum Extrusions [Member] | Residential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	10,056	20,948	21,659	37,413
Aluminum Extrusions [Member] | Electrical [Member]
Disaggregation of Revenue [Line Items]
Sales	6,078	9,687	14,207	16,974
Aluminum Extrusions [Member] | Machinery and Equipment BNL [Domain]
Disaggregation of Revenue [Line Items]
Sales	11,082	15,929	21,806	28,874
Aluminum Extrusions [Member] | Distribution [Member]
Disaggregation of Revenue [Line Items]
Sales	5,344	11,164	7,160	20,924
Aluminum Extrusions [Member] | Aluminum Extrusions Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	121,827	190,308	255,197	348,417
PE Films [Member]
Disaggregation of Revenue [Line Items]
Sales	15,918	31,424	36,099	62,555
PE Films [Member] | Surface Protection Films [Member]
Disaggregation of Revenue [Line Items]
Sales	8,643	23,674	21,497	45,822
PE Films [Member] | Personal Care Materials
Disaggregation of Revenue [Line Items]
Sales	7,275	7,750	14,602	16,733
PE Films [Member] | Film Products Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	15,918	31,424	36,099	62,555
Flexible Packaging Films [Member] [Domain]
Disaggregation of Revenue [Line Items]
Sales	33,223	41,595	64,750	80,839
UNITED STATES
Disaggregation of Revenue [Line Items]
Sales	133,417	213,955	284,027	396,092
Asia [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	5,477	14,680	11,209	27,145
Revenues	3,400	5,300	6,800	11,700
Asia [Member] | Operations Outside United States [Member]
Disaggregation of Revenue [Line Items]
Sales	55	0	160	0
Latin America [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	1,817	1,245	3,676	2,686
CANADA | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	4,955	4,173	9,239	8,366
Europe [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	272	1,085	1,132	2,448
Brazil | Operations Outside United States [Member]
Disaggregation of Revenue [Line Items]
Sales	$ 24,975	$ 28,189	$ 46,603	$ 55,074

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