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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Stock option-based compensation costs	$ 415	$ 86
Subtotal	596,004		$ 572,056
General corporate	117,071		100,920
Cash and cash equivalents	36,302	$ 36,135	34,397	$ 36,491
Total assets	749,377		707,373
PE Films
Total assets	234,301		231,720
Flexible Packaging Films [Member] [Domain]
Total assets	59,550		58,964
Aluminum Extrusions
Total assets	$ 302,153		$ 281,372

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General corporate assets.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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