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Goodwill (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Goodwill (Textual) [Abstract]    
Impairment of Electronics Group's short-term and long-term assets $ 0  
Terminal growth rate 3.00%  
Impairment of goodwill $ 6,900,000 $ 0
Maximum [Member]
   
Goodwill (Textual) [Abstract]    
Expected after tax cash flows period Range 2017  
Minimum [Member]
   
Goodwill (Textual) [Abstract]    
Expected after tax cash flows period Range 2013