Business Segments (Schedule Of Net Sales By Geographic Area) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net Sales by Geographic Area, Total	[1],[2]	$ 866,339	$ 923,033	$ 930,721
United States
Segment Reporting Information [Line Items]
Net Sales by Geographic Area, Total	[1]	528,881	542,395	534,346
Exports From The United States | Asia
Segment Reporting Information [Line Items]
Net Sales by Geographic Area, Total	[1]	75,383	72,597	82,235
Exports From The United States | Canada
Segment Reporting Information [Line Items]
Net Sales by Geographic Area, Total	[1]	45,290	47,391	46,481
Exports From The United States | Europe
Segment Reporting Information [Line Items]
Net Sales by Geographic Area, Total	[1]	9,809	10,874	6,984
Exports From The United States | Latin America
Segment Reporting Information [Line Items]
Net Sales by Geographic Area, Total	[1]	3,464	3,116	3,505
Operations Outside The United States | Brazil
Segment Reporting Information [Line Items]
Net Sales by Geographic Area, Total	[1]	89,829	97,954	109,415
Operations Outside The United States | The Netherlands
Segment Reporting Information [Line Items]
Net Sales by Geographic Area, Total	[1]	53,211	74,329	68,471
Operations Outside The United States | Hungary
Segment Reporting Information [Line Items]
Net Sales by Geographic Area, Total	[1]	32,612	39,457	43,482
Operations Outside The United States | China
Segment Reporting Information [Line Items]
Net Sales by Geographic Area, Total	[1]	18,919	26,109	28,702
Operations Outside The United States | India
Segment Reporting Information [Line Items]
Net Sales by Geographic Area, Total	[1]	$ 8,941	$ 8,811	$ 7,100

[1] Information on exports and foreign operations are provided on the previous page. Cash and cash equivalents includes funds held in locations outside the U.S. of $27.7 million and $40.5 million at December 31, 2015 and 2014, respectively. Export sales relate almost entirely to PE Films. Operations outside the U.S. in The Netherlands, Hungary, China and India also relate to PE Films. Operations in Brazil are primarily related to Flexible Packaging Films, but also include PE Films operations. Sales from locations in The Netherlands and Hungary are primarily to customers located in Europe. Sales from locations in China (Guangzhou and Shanghai) are primarily to customers located in China, but also include other customers in Asia.

[2] The difference between total consolidated sales as reported in the consolidated statements of income and segment, geographic and product group net sales reported in this note is freight of $29.8 million in 2015, $28.8 million in 2014 and $28.6 million in 2013.