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Segment Reporting Schedule of Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Sales	$ 169,070	$ 185,079
Aluminum Extrusions [Member]
Disaggregation of Revenue [Line Items]
Sales	114,222	133,370
Aluminum Extrusions [Member] | Nonresidential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	66,347	78,629
Aluminum Extrusions [Member] | Consumer Durables [Member]
Disaggregation of Revenue [Line Items]
Sales	7,984	10,347
Aluminum Extrusions [Member] | Automotive [Member]
Disaggregation of Revenue [Line Items]
Sales	10,606	12,122
Aluminum Extrusions [Member] | Residential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	7,902	11,603
Aluminum Extrusions [Member] | Electrical [Member]
Disaggregation of Revenue [Line Items]
Sales	5,836	8,129
Aluminum Extrusions [Member] | Machinery and Equipment BNL [Domain]
Disaggregation of Revenue [Line Items]
Sales	12,195	10,724
Aluminum Extrusions [Member] | Distribution [Member]
Disaggregation of Revenue [Line Items]
Sales	3,352	1,816
Aluminum Extrusions [Member] | Aluminum Extrusions Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	114,222	133,370
PE Films [Member]
Disaggregation of Revenue [Line Items]
Sales	24,735	20,182
PE Films [Member] | Surface Protection Films [Member]
Disaggregation of Revenue [Line Items]
Sales	17,011	12,855
PE Films [Member] | Personal Care Materials
Disaggregation of Revenue [Line Items]
Sales	7,724	7,327
PE Films [Member] | Film Products Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	24,735	20,182
Flexible Packaging Films [Member] [Domain]
Disaggregation of Revenue [Line Items]
Sales	30,113	31,527
UNITED STATES
Disaggregation of Revenue [Line Items]
Sales	132,627	150,611
Asia [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	8,825	5,732
Revenues	6,100	3,400
Asia [Member] | Operations Outside United States [Member]
Disaggregation of Revenue [Line Items]
Sales	162	105
Latin America [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	1,331	1,859
CANADA | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	4,539	4,284
Europe [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	255	860
Brazil | Operations Outside United States [Member]
Disaggregation of Revenue [Line Items]
Sales	$ 21,331	$ 21,628

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