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Segment Reporting (Schedule Of Segment Reporting Information By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Intelliject [Member]
Sep. 30, 2012
Intelliject [Member]
Sep. 30, 2013
Intelliject [Member]
Sep. 30, 2012
Intelliject [Member]
Sep. 30, 2013
Film Products [Member]
Sep. 30, 2012
Film Products [Member]
Sep. 30, 2013
Film Products [Member]
Sep. 30, 2012
Film Products [Member]
Sep. 30, 2013
Aluminum Extrusions [Member]
Sep. 30, 2012
Aluminum Extrusions [Member]
Sep. 30, 2013
Aluminum Extrusions [Member]
Sep. 30, 2012
Aluminum Extrusions [Member]
Jun. 30, 2013
Alleghany And Bath County, Virginia [Member]
Sep. 30, 2013
Alleghany And Bath County, Virginia [Member]
Segment Reporting Information [Line Items]                                    
Total net sales $ 235,686 $ 210,518 $ 706,131 $ 631,746         $ 157,187 $ 155,296 $ 469,838 $ 459,221 $ 78,499 $ 55,222 $ 236,293 $ 172,525    
Add back freight 7,508 6,130 22,119 17,404                            
Sales as shown in the Consolidated Statements of Income 243,194 216,648 728,250 649,150                            
Ongoing operations                 19,617 21,092 55,351 49,999 3,426 1,846 12,351 7,349    
Plant shutdowns, asset impairments, restructurings and other                 (155) (87) (364) (1,879) (160) (1,067) (958) (3,214)    
Total 22,728 21,784 66,380 52,255                            
Interest income 138 84 307 337                            
Interest expense 727 708 2,132 2,732                            
Gain (loss) on investment accounted for under fair value method     100 9,000 (3,100) 2,700 100 9,000                    
Unrealized loss on investment property                                 1,000 1,018
Stock option-based compensation costs 260 386 859 1,147                            
Corporate expenses, net 8,414 4,788 24,058 17,060                            
Income from continuing operations before income taxes 10,365 18,686 38,720 40,653                            
Income taxes from continuing operations 2,937 4,476 12,185 11,318 912 (1,209) (322) (3,100)                    
Income from continuing operations 7,428 14,210 26,535 29,335                            
Loss from discontinued operations (450) (6,783) (13,990) (11,557)                            
Net income $ 6,978 $ 7,427 $ 12,545 $ 17,778 $ 1,388 $ (1,880) $ 227 $ (4,926)