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Segment Reporting Schedule of Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Sales	$ 185,079	$ 228,485
Aluminum Extrusions [Member]
Disaggregation of Revenue [Line Items]
Sales	133,370	158,110
Aluminum Extrusions [Member] | Nonresidential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	78,629	80,921
Aluminum Extrusions [Member] | Consumer Durables [Member]
Disaggregation of Revenue [Line Items]
Sales	10,347	16,891
Aluminum Extrusions [Member] | Automotive [Member]
Disaggregation of Revenue [Line Items]
Sales	12,122	13,841
Aluminum Extrusions [Member] | Residential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	11,603	16,465
Aluminum Extrusions [Member] | Electrical [Member]
Disaggregation of Revenue [Line Items]
Sales	8,129	7,287
Aluminum Extrusions [Member] | Machinery and Equipment BNL [Domain]
Disaggregation of Revenue [Line Items]
Sales	10,724	12,945
Aluminum Extrusions [Member] | Distribution [Member]
Disaggregation of Revenue [Line Items]
Sales	1,816	9,760
Aluminum Extrusions [Member] | Aluminum Extrusions Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	133,370	158,110
PE Films [Member]
Disaggregation of Revenue [Line Items]
Sales	20,182	31,131
PE Films [Member] | Surface Protection Films [Member]
Disaggregation of Revenue [Line Items]
Sales	12,855	22,148
PE Films [Member] | Personal Care Materials
Disaggregation of Revenue [Line Items]
Sales	7,327	8,983
PE Films [Member] | Film Products Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	20,182	31,131
Flexible Packaging Films [Member] [Domain]
Disaggregation of Revenue [Line Items]
Sales	31,527	39,244
UNITED STATES
Disaggregation of Revenue [Line Items]
Sales	150,611	182,138
Asia [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	5,732	12,465
Revenues	3,400	6,500
Asia [Member] | Operations Outside United States [Member]
Disaggregation of Revenue [Line Items]
Sales	105	0
Latin America [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	1,859	1,441
CANADA | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	4,284	4,193
Europe [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	860	1,363
Brazil | Operations Outside United States [Member]
Disaggregation of Revenue [Line Items]
Sales	$ 21,628	$ 26,885

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