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Segment Reporting Schedule of Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Sales	$ 159,459	$ 228,986	$ 515,504	$ 720,796
Aluminum Extrusions [Member]
Disaggregation of Revenue [Line Items]
Sales	109,410	161,649	364,607	510,066
Aluminum Extrusions [Member] | Nonresidential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	59,476	86,659	203,889	266,882
Aluminum Extrusions [Member] | Consumer Durables [Member]
Disaggregation of Revenue [Line Items]
Sales	8,662	16,714	30,723	52,409
Aluminum Extrusions [Member] | Automotive [Member]
Disaggregation of Revenue [Line Items]
Sales	13,025	11,543	36,916	39,857
Aluminum Extrusions [Member] | Residential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	7,999	15,136	29,658	52,549
Aluminum Extrusions [Member] | Electrical [Member]
Disaggregation of Revenue [Line Items]
Sales	2,016	4,730	16,223	21,704
Aluminum Extrusions [Member] | Machinery and Equipment BNL [Domain]
Disaggregation of Revenue [Line Items]
Sales	14,202	20,028	36,008	48,902
Aluminum Extrusions [Member] | Distribution [Member]
Disaggregation of Revenue [Line Items]
Sales	4,030	6,839	11,190	27,763
Aluminum Extrusions [Member] | Aluminum Extrusions Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	109,410	161,649	364,607	510,066
PE Films [Member]
Disaggregation of Revenue [Line Items]
Sales	19,938	20,059	56,036	82,613
PE Films [Member] | Surface Protection Films [Member]
Disaggregation of Revenue [Line Items]
Sales	12,755	13,018	34,251	58,839
PE Films [Member] | Personal Care Materials
Disaggregation of Revenue [Line Items]
Sales	7,183	7,041	21,785	23,774
PE Films [Member] | Film Products Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	19,938	20,059	56,036	82,613
Flexible Packaging Films [Member] [Domain]
Disaggregation of Revenue [Line Items]
Sales	30,111	47,278	94,861	128,117
UNITED STATES
Disaggregation of Revenue [Line Items]
Sales	125,407	181,405	409,433	577,496
Asia [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	7,873	7,437	19,082	34,582
Revenues	4,800	4,400	11,700	16,100
Asia [Member] | Operations Outside United States [Member]
Disaggregation of Revenue [Line Items]
Sales	142	0	302	0
Latin America [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	1,764	2,138	5,440	4,824
CANADA | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	3,640	4,065	12,879	12,431
Europe [Member] | Exports From United States [Member]
Disaggregation of Revenue [Line Items]
Sales	282	1,016	1,414	3,464
Brazil | Operations Outside United States [Member]
Disaggregation of Revenue [Line Items]
Sales	$ 20,351	$ 32,925	$ 66,954	$ 87,999

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