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Business Segments (Schedule Of Net Sales By Product Group) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from External Customer [Line Items]      
Net Sales by Product Group [1],[2] $ 936,295 $ 1,029,444 $ 927,647
PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 272,758 332,488 352,459
Flexible Packaging Films [Member] [Domain]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 133,935 123,830 108,355
Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 529,602 573,126 466,833
Personal Care Materials [Member] | PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 161,493 227,090 246,416
Surface Protection Films [Member] | PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 103,893 98,126 99,079
LED lighting products & other films | PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 7,372 7,272 6,964
Subtotal | PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 272,758 332,488 352,459
Nonresidential building & construction | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 272,729 289,572 239,713
Consumer durables | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 57,607 66,416 54,126
Residential building & construction | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 43,554 43,943 40,354
Machinery and Equipment | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 38,657 41,899 33,450
Automotive | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 46,461 48,037 38,261
Distribution | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 34,753 40,924 30,202
Electrical | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 35,841 42,335 30,727
Subtotal | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group $ 529,602 $ 573,126 $ 466,833
[1] Information on exports and foreign operations are provided on the previous page. Cash and cash equivalents includes funds held in locations outside the U.S. of $23.0 million and $31.1 million at December 31, 2019 and 2018, respectively. Export sales relate almost entirely to PE Films. Operations outside the U.S. in The Netherlands, Hungary, China and India also relate to PE Films. Operations in Brazil are primarily related to Flexible Packaging Films, but also include PE Films operations. Sales from locations in The Netherlands and Hungary are primarily to customers located in Europe. Sales from locations in China (Guangzhou and Shanghai) are primarily to customers located in China, but also include other customers in Asia.
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