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Business Segments (Schedule Of Net Sales By Product Group) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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