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Balance Sheet Information (Details 4) (USD $)
 0 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Oct. 02, 2013
Oct. 02, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
LED And Solar
Dec. 31, 2013
Tools
Dec. 31, 2013
Tools
LED And Solar
Property, plant and equipment, held for sale                
Assets held for sale             $ 7,200,000  
Assets converted and sold             3,700,000  
Aggregate selling price             7,400,000  
Asset impairment charge 0 0 1,220,000 1,335,000 584,000 900,000   900,000
Goodwill                
Balance at the beginning of the period     55,828,000          
Acquisition     35,520,000          
Balance at the end of the period     $ 91,348,000 $ 55,828,000