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Segment Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Dec. 31, 2012
Net revenue from unaffiliated customers:      
Net revenue from unaffiliated customers $ 78,411 $ 96,463  
Gross profit (loss):      
Gross profit 8,076 12,514  
Operating income (loss):      
Operating income (loss) (6,881) 4,503  
Total assets:      
Total assets 168,805   160,968
Industrial Group [Member]
      
Net revenue from unaffiliated customers:      
Net revenue from unaffiliated customers 71,149 82,522  
Gross profit (loss):      
Gross profit 8,110 9,922  
Operating income (loss):      
Operating income (loss) 5,385 7,356  
Total assets:      
Total assets 124,271   114,268
Electronics Group [Member]
      
Net revenue from unaffiliated customers:      
Net revenue from unaffiliated customers 7,262 13,941  
Gross profit (loss):      
Gross profit (34) 2,592  
Operating income (loss):      
Operating income (loss) (10,151) (264)  
Total assets:      
Total assets 30,638   38,852
General, corporate and other [Member]
      
Operating income (loss):      
Operating income (loss) (2,115) (2,589)  
Total assets:      
Total assets $ 13,896   $ 7,848