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Business Segments (Schedule Of Net Sales By Product Group) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue from External Customer [Line Items]      
Net Sales by Product Group [1],[2] $ 927,647 $ 799,272 $ 866,339
PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 352,459 331,146 385,550
Flexible Packaging Films [Member] [Domain]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 108,355 108,028 105,332
Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 466,833 360,098 375,457
Personal Care Materials [Member] | PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 246,416 238,213 287,768
Surface protection films | PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 99,079 84,013 90,197
LED lighting products & other films | PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 6,964 8,920 7,585
Subtotal | PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 352,459 331,146 385,550
Nonresidential building & construction | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 239,713 212,863 221,363
Consumer durables | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 54,126 39,293 41,835
Residential building & construction | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 40,354 20,252 22,737
Machinery and Equipment | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 33,450 20,872 18,102
Automotive | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 38,261 34,700 30,250
Distribution | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 30,202 20,506 18,659
Electrical | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 30,727 11,612 22,511
Subtotal | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group $ 466,833 $ 360,098 $ 375,457
[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 $32.7 million and $23.8 million at December 31, 2017 and 2016, 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.
[2] The difference between total consolidated sales as reported in the consolidated statements of income and segment, geographic and product group net sales reported in this note is freight of $33.7 million in 2017, $29.1 million in 2016 and $29.8 million in 2015.