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Business Segments (Schedule Of Net Sales By Geographic Area) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] $ 798,223 $ 729,604 $ 797,344
United States      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 614,987 530,243 593,599
Exports From The United States | Asia      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 59,242 80,217 82,342
Revenues 32,700 35,100 32,100
Exports From The United States | Canada      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 17,776 18,024 15,022
Exports From The United States | Europe      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 4,489 5,440 5,752
Exports From The United States | Latin America      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 4,937 2,169 4,135
Operations Outside The United States | Brazil      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 96,792 93,511 96,274
Operations Outside The United States | China      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] $ 0 $ 0 $ 220
[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.