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Investments (Schedule Of Fair Value Method Investments, Balance Sheets And Income Statements) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets                        
Cash and cash equivalents $ 36,491 [1]       $ 29,511 [1]       $ 36,491 [1] $ 29,511 [1] $ 44,156 $ 50,056
Net property, plant and equipment 223,091       260,725       223,091 260,725    
Patents 40,552       33,601       40,552 33,601    
Other assets 9,419       10,006       9,419 10,006    
Total assets [1] 755,743       651,162       755,743 651,162    
Liabilities and Shareholders’ Equity                        
Other noncurrent liabilities 152,000       95,000       152,000 95,000    
Equity 343,780       310,783       343,780 310,783 272,748 $ 372,029
Total liabilities and shareholders’ equity 755,743       651,162       755,743 651,162    
Revenues & Expenses:                        
Cost of goods sold                 775,628 668,626 725,459  
Income tax (expense) benefit [2]                 53,163 (3,217) (8,928)  
Net income (loss) $ (17,929) $ 8,274 $ 44,204 $ 3,703 $ 1,728 $ 12,048 $ 3,408 $ 7,281 38,251 $ 24,466 (32,135)  
Harbinger Capital Partners Special Situations Fund L P [Member]                        
Investments, Other Investments [Line Items]                        
Total Withdrawal Proceeds Received                 $ 0   $ 100  
[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] See Notes 1, 3, 4 and 17 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.