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Business Segments (Schedule Of Net Sales By Geographic Area) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1],[2] $ 927,647 $ 799,272 $ 866,339
United States      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 584,066 475,734 528,881
Exports From The United States | Asia      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 84,846 73,220 75,383
Exports From The United States | Canada      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 46,505 45,683 45,290
Exports From The United States | Europe      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 8,505 7,348 9,809
Exports From The United States | Latin America      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 15,199 5,561 3,464
Operations Outside The United States | Brazil      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 87,155 90,571 89,829
Operations Outside The United States | The Netherlands      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 54,380 54,352 53,211
Operations Outside The United States | Hungary      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 24,727 24,207 32,612
Operations Outside The United States | China      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] 12,199 14,390 18,919
Operations Outside The United States | India      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total [1] $ 10,065 $ 8,206 $ 8,941
[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] 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 $33.7 million in 2017, $29.1 million in 2016 and $29.8 million in 2015.