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Segment Reporting (Schedule Of Segment Reporting Information By Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Assets $ 807,961   $ 807,961   $ 651,162
Total net sales 239,435 $ 201,467 452,154 $ 401,800  
Add back freight 7,912 7,066 16,218 14,067  
Sales as shown in the Consolidated Statements of Income 247,347 208,533 468,372 415,867  
Total Segment Income (Loss) 34,658 12,321 45,112 30,946  
Interest income 55 51 129 88  
Interest expense 1,642 947 2,822 2,032  
Gain on investment accounted for under fair value method     24,800 1,100  
Gain (Loss) on Disposition of Assets     307 0  
Stock option-based compensation costs 38 31 41 (7)  
Corporate expenses, net 7,502 6,969 14,026 14,886  
Income from continuing operations before income taxes 47,031 4,725 53,152 15,223  
Income taxes from continuing operations 2,827 1,317 5,246 4,533  
Net income 44,204 3,408 47,906 10,690  
kaleo          
Segment Reporting Information [Line Items]          
Assets 171,562   171,562   131,234
Gain on investment accounted for under fair value method 21,500 300 24,800 1,100  
Income taxes from continuing operations 490 0 490 9  
Net income 8,834 (7,106) (8,009) (13,245)  
PE Films          
Segment Reporting Information [Line Items]          
Assets 296,728   296,728   278,558
Total net sales 89,639 80,813 176,050 169,295  
Operating profit from ongoing operations 10,682 4,318 19,713 14,553  
Plant shutdowns, asset impairments, restructurings and other (904) (1,356) (2,972) (2,491)  
Flexible Packaging Films [Member] [Domain]          
Segment Reporting Information [Line Items]          
Assets 152,311   152,311   156,836
Total net sales 26,588 27,207 53,297 53,585  
Operating profit from ongoing operations (319) (942) (2,317) 1,090  
Plant shutdowns, asset impairments, restructurings and other 11,856 0 11,856 0  
Aluminum Extrusions          
Segment Reporting Information [Line Items]          
Assets 267,549   267,549   $ 147,639
Total net sales 123,208 93,447 222,807 178,920  
Operating profit from ongoing operations 11,772 10,859 21,601 18,359  
Plant shutdowns, asset impairments, restructurings and other $ 1,571 $ (558) $ (2,769) $ (565)