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Selected Quarterly Financial Information (Details 4) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Oct. 02, 2013
Oct. 02, 2012
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
LED And Solar
Dec. 31, 2012
Data Storage
Other Quarterly Items                
Asset impairment charge $ 0 $ 0   $ 1,220,000 $ 1,335,000 $ 584,000 $ 900,000 $ 1,300,000
Impairment charges related to other assets     $ 300,000 $ 300,000