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Segment Reporting (Schedule Of Segment Reporting Information By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information [Line Items]    
Total net sales $ 234,324 $ 211,307
Add back freight 7,202 5,336
Sales as shown in the Consolidated Statements of Income 241,526 216,643
Total 21,266 15,824
Interest income 78 170
Interest expense 690 1,007
Gain on investment accounted for under fair value method 1,100 3,600
Stock option-based compensation costs 316 446
Corporate expenses, net 8,157 6,272
Income from continuing operations before income taxes 13,281 11,869
Income taxes 3,764 4,132
Income from continuing operations 9,517 7,737
Loss from discontinued operations (5,240) (4,739)
Net income (loss) 4,277 2,998
Intelliject [Member]
    
Segment Reporting Information [Line Items]    
Gain on investment accounted for under fair value method 1,100 3,600
Income taxes (1,087) (950)
Net income (loss) (915) (1,539)
Film Products [Member]
    
Segment Reporting Information [Line Items]    
Total net sales 154,385 153,699
Ongoing operations 17,007 15,466
Plant shutdowns, asset impairments, restructurings and other (102) (284)
Aluminum Extrusions [Member]
    
Segment Reporting Information [Line Items]    
Total net sales 79,939 57,608
Ongoing operations 4,614 1,703
Plant shutdowns, asset impairments, restructurings and other $ (253) $ (1,061)