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Business Segments (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |
Net Sales | [1],[2] | $ 866,339 | $ 923,033 | $ 930,721
PE Films [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Sales |  | 385,550 | 464,339 | 495,386
PE Films [Member] | The Procter And Gamble Company |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Sales |  | $ 163,900 | $ 220,800 | $ 261,900
[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 $27.7 million and $40.5 million at December 31, 2015 and 2014, 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 $29.8 million in 2015, $28.8 million in 2014 and $28.6 million in 2013.

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