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Business Segments (Schedule Of Segment Reporting Information By Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenue from External Customer [Line Items]                      
Net Sales                 $ 577,014 $ 551,566 $ 735,443
Sales $ 154,049 $ 146,064 $ 153,940 $ 143,972 $ 136,167 $ 134,569 $ 143,350 $ 159,237 598,025 573,323 761,985
Plant shutdowns, asset impairments, restructurings and other                 5,766 8,529 956
Investment Income, Interest                 36 514 16
Interest and Debt Expense                 4,664 6,316 4,141
Corporate expenses, net                 24,520 33,727 40,402
Income (loss) from continuing operations before income taxes                 880 (150,465) 9,564
Income tax expense (benefit)                 (165) (51,300) (3,021)
Net income (loss) (72,698) (3,946) 8,792 3,288 (35,591) (50,380) (18,922) (1,009) (64,565) (105,905) 28,455
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (7,339) (3,389) 9,170 2,604 (34,057) (49,172) (15,918) (17) 1,045 (99,165) 12,585
Disposal Group, Including Discontinued Operation, Operating Income (Loss) $ (65,359) $ (557) $ (378) $ 684 $ (1,534) $ (1,208) $ (3,004) $ (992) (65,610) (6,740) 15,870
Goodwill impairment                 13,271 34,891 0
kaleo                      
Revenue from External Customer [Line Items]                      
Gain (loss) on investment accounted for under the fair value method                 144 262 1,406
PE Films                      
Revenue from External Customer [Line Items]                      
Net Sales                 105,199 76,763 97,571
Variable costs                 50,289 40,824 56,085
LIFO inventory adjustment                 (174) (1,333) 521
Manufacturing fixed costs (e)                 13,248 13,793 15,216
Selling, general and administrative costs (e)                 11,245 12,106 14,116
Segments Other costs                 105 156 (316)
Earnings before interest, taxes, depreciation and amortization (EBITDA)                 30,486 11,217 11,949
Goodwill impairment                 0 (34,891)  
Aluminum Extrusions                      
Revenue from External Customer [Line Items]                      
Net Sales                 471,815 474,803 637,872
Variable costs                 354,397 365,320 503,374
LIFO inventory adjustment                 1,234 (944) (5,402)
Manufacturing fixed costs (e)                 40,123 41,028 43,073
Selling, general and administrative costs (e)                 33,638 29,725 31,641
Segments Other costs                 1,066 1,698 (1,614)
Earnings before interest, taxes, depreciation and amortization (EBITDA)                 41,357 37,976 66,800
Goodwill impairment                 (13,271) 0  
Subtotal                      
Revenue from External Customer [Line Items]                      
Variable costs                 404,686 406,144 559,459
LIFO inventory adjustment                 1,060 (2,277) (4,881)
Manufacturing fixed costs (e)                 53,371 54,821 58,289
Selling, general and administrative costs (e)                 44,883 41,831 45,757
Segments Other costs                 1,171 1,854 (1,930)
Earnings before interest, taxes, depreciation and amortization (EBITDA)                 71,843 49,193 78,749
Depreciation and Amortization                 22,922 24,449 23,694
Freight                      
Revenue from External Customer [Line Items]                      
Cost of Goods and Services Sold                 $ 21,011 $ 21,757 $ 26,542