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Goodwill and Purchased Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Dec. 25, 2010
Changes in the carrying value of goodwill by reportable segment      
Impact of currency exchange $ (954) $ (438)  
Goodwill 57,106 58,060 [1] 58,498
Semiconductor Equipment [Member]
     
Changes in the carrying value of goodwill by reportable segment      
Impact of currency exchange (888) (408)  
Goodwill 53,984 54,872 55,280
Microwave Communications [Member]
     
Changes in the carrying value of goodwill by reportable segment      
Impact of currency exchange (66) (30)  
Goodwill $ 3,122 $ 3,188 $ 3,218
[1] Derived from December 31, 2011 audited financial statements.