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Segment Reporting Schedule of Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Sales	$ 228,986	$ 202,253	$ 720,796	$ 584,937
Aluminum Extrusions [Member]
Disaggregation of Revenue [Line Items]
Sales	161,649	137,086	510,066	394,492
Aluminum Extrusions [Member] | Nonresidential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	86,659	68,590	266,882	195,941
Aluminum Extrusions [Member] | Consumer Durables [Member]
Disaggregation of Revenue [Line Items]
Sales	16,714	12,873	52,409	39,611
Aluminum Extrusions [Member] | Automotive [Member]
Disaggregation of Revenue [Line Items]
Sales	11,543	10,150	39,857	32,750
Aluminum Extrusions [Member] | Residential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	15,136	13,154	52,549	39,755
Aluminum Extrusions [Member] | Electrical [Member]
Disaggregation of Revenue [Line Items]
Sales	4,730	8,015	21,704	24,767
Aluminum Extrusions [Member] | Machinery and Equipment BNL [Domain]
Disaggregation of Revenue [Line Items]
Sales	20,028	11,611	48,902	31,190
Aluminum Extrusions [Member] | Distribution [Member]
Disaggregation of Revenue [Line Items]
Sales	6,839	12,693	27,763	30,478
Aluminum Extrusions [Member] | Aluminum Extrusions Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	161,649	137,086	510,066	394,492
PE Films [Member]
Disaggregation of Revenue [Line Items]
Sales	20,059	28,501	82,613	87,885
PE Films [Member] | Surface Protection Films [Member]
Disaggregation of Revenue [Line Items]
Sales	13,018	20,905	58,839	65,997
PE Films [Member] | Personal Care Materials
Disaggregation of Revenue [Line Items]
Sales	7,041	7,596	23,774	21,888
PE Films [Member] | Film Products Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	20,059	28,501	82,613	87,885
Flexible Packaging Films [Member] [Domain]
Disaggregation of Revenue [Line Items]
Sales	47,278	36,666	128,117	102,560
UNITED STATES
Disaggregation of Revenue [Line Items]
Sales	181,405	157,969	577,496	447,585
Asia [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	7,437	12,609	34,582	43,129
Revenues	4,400	7,400	16,100	25,000
Latin America [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	2,138	1,170	4,824	3,630
CANADA | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	4,065	4,107	12,431	14,145
Europe [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	1,016	1,343	3,464	3,323
Brazil | Operations Outside United States [Member]
Disaggregation of Revenue [Line Items]
Sales	$ 32,925	$ 25,055	$ 87,999	$ 73,125

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