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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, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets                        
Cash and cash equivalents $ 30,521       $ 11,846       $ 30,521 $ 11,846 $ 31,422 $ 34,397
Net property, plant and equipment 170,381       166,545       170,381 166,545    
Patents 14,152       18,820       14,152 18,820    
Other assets 2,460       3,506       2,460 3,506    
Total assets [1] 523,584       514,870       523,584 514,870    
Liabilities and Shareholders’ Equity                        
Other noncurrent liabilities 73,000       134,000       73,000 134,000    
Equity 184,722       109,055       184,722 109,055 376,749 $ 354,857
Total liabilities and shareholders’ equity 523,584       514,870       523,584 514,870    
Revenues & Expenses:                        
Cost of goods sold                 (649,690) (558,967) (641,140)  
Income tax (expense) benefit [2]                 (9,284) 8,213 (13,545)  
Net income (loss) $ 21,352 $ 6,203 $ 21,236 $ 9,031 $ 895 $ (65,213) $ 11,196 $ (22,321) $ 57,826 $ (75,444) $ 48,259  
[1] Cash and cash equivalents includes funds held in locations outside the U.S. of $16.4 million and $9.4 million at December 31, 2021 and 2020, respectively. (c)Information on exports and foreign operations are provided on the previous page. Export sales relate almost entirely to PE Films. Operations in China relate to PE Films. Operations in Brazil relate to Flexible Packaging Films.
[2] See Notes 1, 9, 15, 16 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.