Segment Reporting (Schedule Of Segment Reporting Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Total net sales	$ 228,443	$ 234,324
Add back freight	6,770	7,202
Sales as shown in the Consolidated Statements of Income	235,213	241,526
Total	20,238	21,266
Interest income	195	78
Interest expense	630	690
Gain on investment accounted for under fair value method	0	1,100
Stock option-based compensation costs	241	316
Corporate expenses, net	6,475	8,157
Income from continuing operations before income taxes	13,087	13,281
Income taxes from continuing operations	4,608	3,764
Income from continuing operations	8,479	9,517
Loss from discontinued operations	0	(5,240)
Net income	8,479	4,277
kaleo
Segment Reporting Information [Line Items]
Gain on investment accounted for under fair value method	0	1,100
Income taxes from continuing operations	(2,239)	(1,087)
Net income	(3,519)	(915)
Film Products
Segment Reporting Information [Line Items]
Total net sales	149,160	154,385
Ongoing operations	16,722	17,007
Plant shutdowns, asset impairments, restructurings and other	(1,245)	(102)
Aluminum Extrusions
Segment Reporting Information [Line Items]
Total net sales	79,283	79,939
Ongoing operations	4,761	4,614
Plant shutdowns, asset impairments, restructurings and other	$ 0	$ (253)