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Segment Reporting (Schedule Of Segment Reporting Information By Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Assets $ 767,667   $ 651,162
Total net sales 212,720 $ 200,332  
Add back freight 8,306 7,001  
Sales as shown in the Consolidated Statements of Income 221,026 207,333  
Total Segment Income (Loss) 10,453 18,624  
Interest income 74 37  
Interest expense 1,180 1,085  
Gain on investment accounted for under fair value method 3,300 800  
Gain (Loss) on Disposition of Assets 164 0  
Stock option-based compensation costs 3 (37)  
Corporate expenses, net 6,523 7,916  
Income from continuing operations before income taxes 6,121 10,497  
Income taxes from continuing operations 2,418 3,216  
Net income 3,703 7,281  
kaleo      
Segment Reporting Information [Line Items]      
Assets 165,055   131,234
Gain on investment accounted for under fair value method 3,300 800  
Income taxes from continuing operations 0 8  
Net income (16,844) (6,139)  
PE Films      
Segment Reporting Information [Line Items]      
Assets 286,824   278,558
Total net sales 86,411 88,481  
Operating profit from ongoing operations 9,031 10,235  
Plant shutdowns, asset impairments, restructurings and other (2,068) (1,135)  
Flexible Packaging Films [Member] [Domain]      
Segment Reporting Information [Line Items]      
Assets 156,568   156,836
Total net sales 26,710 26,377  
Operating profit from ongoing operations (1,998) 2,032  
Plant shutdowns, asset impairments, restructurings and other 0 0  
Aluminum Extrusions      
Segment Reporting Information [Line Items]      
Assets 257,557   $ 147,639
Total net sales 99,599 85,474  
Operating profit from ongoing operations 9,829 7,499  
Plant shutdowns, asset impairments, restructurings and other $ (4,341) $ (7)