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Fair Value Measurements and Disclosures (Details 1) (Level 3 [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 29, 2014
Level 3 [Member]
 
Fair value measurement on recurring basis, unobservable input reconciliation  
Fair value at December 28, 2013 $ 2,783
Payments made to Zygo Corporation (100)
Change in fair value included in earnings (5)
Fair Value at March 29, 2014 $ 2,678