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Business Segments (Schedule Of Segment Reporting Information By Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue from External Customer [Line Items]      
Net Sales $ 903,582 $ 798,223 $ 729,604
Sales 938,564 826,455 755,290
Goodwill, Impairment Loss 0 0 (13,696)
Total 79,016 102,108 85,769
Interest income 57 73 44
Interest expense 4,990 3,386 2,587
Gain (loss) on investment accounted for under the fair value method (14,602) (14,160) (14,720)
Loss on sale of business     50,027
Stock option-based compensation expense 1,424 2,495 2,161
Corporate expenses, net 41,295 41,859 42,912
Income (loss) from continuing operations before income taxes 32,770 67,221 (25,046)
Income tax expense (benefit) 4,389 9,284 (8,213)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 28,381 57,937 (16,833)
Income (loss) from discontinued operations, net of tax 74 (111) (58,611)
Net income (loss) 28,455 57,826 (75,444)
kaleo      
Revenue from External Customer [Line Items]      
Gain (loss) on investment accounted for under the fair value method 1,406 12,780 (60,900)
Bright View Technologies      
Revenue from External Customer [Line Items]      
Loss on sale of business 0 0 2,299
PE Films      
Revenue from External Customer [Line Items]      
Net Sales 97,571 118,920 139,288
Earnings before interest, taxes, depreciation and amortization (EBITDA) 11,949 27,694 45,107
Cost, Depreciation and Amortization 6,280 6,263 6,762
Earnings before interest and taxes (EBIT) 5,669 21,431 38,345
Plant shutdowns, asset impairments, restructurings and other (646) (371) (1,974)
Goodwill, Impairment Loss   0  
Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales 637,872 539,325 455,711
Earnings before interest, taxes, depreciation and amortization (EBITDA) 66,800 55,948 55,137
Cost, Depreciation and Amortization 17,414 16,272 17,403
Earnings before interest and taxes (EBIT) 49,386 39,676 37,734
Plant shutdowns, asset impairments, restructurings and other (310) 3,237 (3,506)
Goodwill, Impairment Loss 0 0 (13,696)
PET Films      
Revenue from External Customer [Line Items]      
Earnings before interest, taxes, depreciation and amortization (EBITDA) 27,452 31,684 30,645
Cost, Depreciation and Amortization 2,444 1,988 1,761
Earnings before interest and taxes (EBIT) 25,008 29,696 28,884
Flexible Packaging Films      
Revenue from External Customer [Line Items]      
Net Sales 168,139 139,978 134,605
Plant shutdowns, asset impairments, restructurings and other (91) 8,439 (18)
Freight      
Revenue from External Customer [Line Items]      
Cost of Goods and Services Sold $ 34,982 $ 28,232 $ 25,686