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Business Segments (Schedule Of Identifiable Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Identifiable Assets, Total | [1] | $ 712,668 |  | $ 707,373 |  |  |
Cash and cash equivalents |  | 31,422 | [1] | 34,397 | [1] | $ 36,491 | $ 29,511
PE Films [Member] |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Identifiable Assets, Total |  | 230,415 |  | 231,720 |  |  |
Flexible Packaging Films [Member] [Domain] |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Identifiable Assets, Total |  | 74,016 |  | 58,964 |  |  |
General Corporate |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Identifiable Assets, Total | [1],[2] | 111,788 |  | 100,920 |  |  |
Subtotal |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Identifiable Assets, Total |  | 569,458 |  | 572,056 |  |  |
Aluminum Extrusions |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Identifiable Assets, Total |  | $ 265,027 |  | $ 281,372 |  |  |
[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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