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Segment Reporting Schedule of Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Sales	$ 228,485	$ 178,599
Aluminum Extrusions [Member]
Disaggregation of Revenue [Line Items]
Sales	158,110	118,125
Aluminum Extrusions [Member] | Nonresidential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	80,921	57,229
Aluminum Extrusions [Member] | Consumer Durables [Member]
Disaggregation of Revenue [Line Items]
Sales	16,891	13,152
Aluminum Extrusions [Member] | Automotive [Member]
Disaggregation of Revenue [Line Items]
Sales	13,841	11,415
Aluminum Extrusions [Member] | Residential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	16,465	12,708
Aluminum Extrusions [Member] | Electrical [Member]
Disaggregation of Revenue [Line Items]
Sales	7,287	7,180
Aluminum Extrusions [Member] | Machinery and Equipment BNL [Domain]
Disaggregation of Revenue [Line Items]
Sales	12,945	8,925
Aluminum Extrusions [Member] | Distribution [Member]
Disaggregation of Revenue [Line Items]
Sales	9,760	7,516
Aluminum Extrusions [Member] | Aluminum Extrusions Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	158,110	118,125
PE Films [Member]
Disaggregation of Revenue [Line Items]
Sales	31,131	27,953
PE Films [Member] | Surface Protection Films [Member]
Disaggregation of Revenue [Line Items]
Sales	22,148	20,601
PE Films [Member] | Personal Care Materials
Disaggregation of Revenue [Line Items]
Sales	8,983	7,352
PE Films [Member] | Film Products Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	31,131	27,953
Flexible Packaging Films [Member] [Domain]
Disaggregation of Revenue [Line Items]
Sales	39,244	32,521
UNITED STATES
Disaggregation of Revenue [Line Items]
Sales	182,138	132,897
Asia [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	12,465	13,362
Revenues	6,500	6,900
Latin America [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	1,441	1,102
CANADA | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	4,193	5,434
Europe [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	1,363	955
Brazil | Operations Outside United States [Member]
Disaggregation of Revenue [Line Items]
Sales	$ 26,885	$ 24,849

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