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Business Segments (Schedule Of Net Sales By Product Group) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Net Sales by Product Group	[1]	$ 729,604	$ 797,344	$ 824,664
PE Films [Member]
Revenue from External Customer [Line Items]
Net Sales by Product Group		139,288	133,807	127,708
Flexible Packaging Films [Member] [Domain]
Revenue from External Customer [Line Items]
Net Sales by Product Group		134,605	133,935	123,830
Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group		455,711	529,602	573,126
Personal Care Materials [Member] | PE Films [Member]
Revenue from External Customer [Line Items]
Net Sales by Product Group		22,700	22,542	22,310
Surface protection films | PE Films [Member]
Revenue from External Customer [Line Items]
Net Sales by Product Group		109,097	103,893	98,126
LED lighting products & other films | PE Films [Member]
Revenue from External Customer [Line Items]
Net Sales by Product Group		7,491	7,372	7,272
Subtotal | PE Films [Member]
Revenue from External Customer [Line Items]
Net Sales by Product Group		139,288	133,807	127,708
Nonresidential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group		253,126	272,729	289,572
Consumer durables | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group		44,167	57,607	66,416
Residential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group		40,049	43,554	43,943
Machinery and Equipment | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group		30,649	38,657	41,899
Automotive | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group		35,895	46,461	48,037
Distribution | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group		28,339	34,753	40,924
Electrical | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group		23,486	35,841	42,335
Subtotal | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group		$ 455,711	$ 529,602	$ 573,126
[1] Cash and cash equivalents includes funds held in locations outside the U.S. of $9.4 million and $8.9 million at December 31, 2020 and 2019, respectively. (c)Information on exports and foreign operations are provided on the previous page. Export sales relate almost entirely to PE Films. Operations in China relate to PE Films. Operations in Brazil relate to Flexible Packaging Films.

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