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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Stock option-based compensation costs | $ 415 | $ 86 |  |
Subtotal | 596,004 |  | $ 572,056 |
General corporate | 117,071 |  | 100,920 |
Cash and cash equivalents | 36,302 | $ 36,135 | 34,397 | $ 36,491
Total assets | 749,377 |  | 707,373 |
PE Films |  |  |  |
Total assets | 234,301 |  | 231,720 |
Flexible Packaging Films [Member] [Domain] |  |  |  |
Total assets | 59,550 |  | 58,964 |
Aluminum Extrusions |  |  |  |
Total assets | $ 302,153 |  | $ 281,372 |

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