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Segment Reporting Schedule of Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Sales	$ 204,085	$ 180,365	$ 382,684	$ 365,627
UNITED STATES
Disaggregation of Revenue [Line Items]
Sales	156,719	130,636	289,616	265,620
PE Films [Member]
Disaggregation of Revenue [Line Items]
Sales	31,430	40,203	59,384	77,004
PE Films [Member] | Personal Care Materials [Member]
Disaggregation of Revenue [Line Items]
Sales	6,940	5,449	14,293	12,219
PE Films [Member] | Surface Protection Films [Member]
Disaggregation of Revenue [Line Items]
Sales	24,490	31,699	45,091	60,052
PE Films [Member] | Films For Other Markets [Member]
Disaggregation of Revenue [Line Items]
Sales	0	3,055	0	4,733
PE Films [Member] | Film Products Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	31,430	40,203	59,384	77,004
Flexible Packaging Films [Member] [Domain]
Disaggregation of Revenue [Line Items]
Sales	33,374	34,104	65,895	64,678
Aluminum Extrusions [Member]
Disaggregation of Revenue [Line Items]
Sales	139,281	106,058	257,405	223,945
Aluminum Extrusions [Member] | Nonresidential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	70,122	64,726	127,350	127,865
Aluminum Extrusions [Member] | Consumer Durables [Member]
Disaggregation of Revenue [Line Items]
Sales	13,586	7,782	26,738	20,331
Aluminum Extrusions [Member] | Distribution [Member]
Disaggregation of Revenue [Line Items]
Sales	10,269	6,521	17,785	14,259
Aluminum Extrusions [Member] | Automotive [Member]
Disaggregation of Revenue [Line Items]
Sales	11,185	5,572	22,600	15,043
Aluminum Extrusions [Member] | Residential Building And Construction [Member]
Disaggregation of Revenue [Line Items]
Sales	13,893	9,052	26,601	18,867
Aluminum Extrusions [Member] | Aluminum Extrusions Subtotal [Member]
Disaggregation of Revenue [Line Items]
Sales	139,281	106,058	257,405	223,945
Aluminum Extrusions [Member] | Machinery and Equipment BNL [Domain]
Disaggregation of Revenue [Line Items]
Sales	10,654	7,630	19,579	15,566
Aluminum Extrusions [Member] | Electrical [Member]
Disaggregation of Revenue [Line Items]
Sales	9,572	4,775	16,752	12,014
Exports From United States [Member] | Asia [Member]
Disaggregation of Revenue [Line Items]
Sales	17,158	23,495	30,520	45,561
Revenues	10,800	10,000	17,700	19,300
Exports From United States [Member] | CANADA
Disaggregation of Revenue [Line Items]
Sales	4,604	1,530	10,038	6,159
Exports From United States [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Sales	1,025	1,487	1,980	2,804
Exports From United States [Member] | Latin America [Member]
Disaggregation of Revenue [Line Items]
Sales	1,358	502	2,460	1,488
Operations Outside United States [Member] | BRAZIL
Disaggregation of Revenue [Line Items]
Sales	$ 23,221	$ 22,715	$ 48,070	$ 43,995

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