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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group | [1],[2] | $ 799,272 | $ 866,339 | $ 923,033
PE Films [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 331,146 | 385,550 | 464,339
Flexible Packaging Films [Member] [Domain] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 108,028 | 105,332 | 114,348
Aluminum Extrusions |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 360,098 | 375,457 | 344,346
Personal Care Materials [Member] | PE Films [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 238,213 | 287,768 | 367,451
Surface protection films | PE Films [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 84,013 | 90,197 | 90,129
LED lighting products & other films | PE Films [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 8,920 | 7,585 | 6,759
Subtotal | PE Films [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 331,146 | 385,550 | 464,339
Nonresidential building & construction | Aluminum Extrusions |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 212,863 | 221,363 | 200,707
Consumer durables | Aluminum Extrusions |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 39,293 | 41,835 | 44,897
Residential building & construction | Aluminum Extrusions |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 20,252 | 22,737 | 21,470
Machinery and Equipment | Aluminum Extrusions |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 20,872 | 18,102 | 26,907
Automotive | Aluminum Extrusions |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 34,700 | 30,250 | 22,272
Distribution | Aluminum Extrusions |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 20,506 | 18,659 | 15,318
Electrical | Aluminum Extrusions |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | 11,612 | 22,511 | 12,775
Subtotal | Aluminum Extrusions |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net Sales by Product Group |  | $ 360,098 | $ 375,457 | $ 344,346
[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 $23.8 million and $27.7 million at December 31, 2016 and 2015, 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 $29.1 million in 2016, $29.8 million in 2015 and $28.8 million in 2014.

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