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Plants Shutdowns, Asset Impairments, Restructurings And Other (Schedule Of Accrued Expenses Associated With Asset Impairments And Exit And Disposal Activities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		13 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019
Restructuring Reserve [Roll Forward]
January 1, 2019			$ 776
Charges			2,131
Cash payments			(1,200)
Charges against assets			(695)
June 30, 2019	$ 1,012		1,012		$ 1,012
Restructuring Reserve, Accrual Adjustment			0
Severance (a)
Restructuring Reserve [Roll Forward]
January 1, 2019			616
Charges			968
Cash payments			(677)
June 30, 2019	907		907		907
Long Lived Asset Impairment [Member]
Restructuring Reserve [Roll Forward]
January 1, 2019			0
Charges			695
Cash payments			0
Charges against assets			(695)
June 30, 2019	0		0		0
Restructuring Reserve, Accrual Adjustment			0
Other
Restructuring Reserve [Roll Forward]
January 1, 2019			160
Charges			468
Cash payments			(523)
Charges against assets			0
June 30, 2019	105		105		105
Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs		$ 400		$ 400
PE Films
Restructuring Cost and Reserve [Line Items]
Severance Costs			500
PE Films | Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Cash payments	$ (300)		$ (500)		$ (3,000)

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