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Segment Reporting (Schedule Of Segment Reporting Information By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Sales	$ 228,485	$ 178,599
Sales as shown in the condensed consolidated statements of income	236,566	184,822
Total Segment Income (Loss)	29,345	24,143
Interest income	29	7
Interest expense	786	822
Gain on investment in kaléo	0	(400)
Stock option-based compensation costs	631	468
Corporate expenses, net	10,722	10,863
Income (loss) from continuing operations before income taxes	17,235	12,715
Income Tax Expense (Benefit)	778	3,097
Income from continuing operations	16,457	9,618
Income (loss) from discontinued operations, net of tax	(35)	(587)
Net income (loss)	16,422	9,031
kaleo [Member]
Segment Reporting Information [Line Items]
Gain on investment in kaléo	0	718
Shipping and Handling [Member]
Segment Reporting Information [Line Items]
Cost of Goods and Services Sold	8,081	6,223
Aluminum Extrusions [Member]
Segment Reporting Information [Line Items]
Sales	158,110	118,125
Earnings before interest, taxes, depreciation and amortization (EBITDA)	23,919	13,302
Depreciation, Depletion and Amortization	(4,261)	(4,130)
Earnings before interest and taxes (EBIT)	19,658	9,172
EBITDA	(105)	183
PE Films [Member]
Segment Reporting Information [Line Items]
Sales	31,131	27,953
Earnings before interest, taxes, depreciation and amortization (EBITDA)	7,047	7,213
Depreciation, Depletion and Amortization	(1,595)	(1,420)
Earnings before interest and taxes (EBIT)	5,452	5,793
EBITDA	(102)	(124)
Flexible Packaging Films [Member] [Domain]
Segment Reporting Information [Line Items]
Sales	39,244	32,521
Flexible Packaging Films [Member]
Segment Reporting Information [Line Items]
Earnings before interest, taxes, depreciation and amortization (EBITDA)	5,035	9,623
Depreciation, Depletion and Amortization	(550)	(466)
Earnings before interest and taxes (EBIT)	4,485	9,157
EBITDA	$ (43)	$ (38)

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