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Rollforward of Warranty Reserve (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Disclosure Rollforward Of Warranty Reserve [Abstract]    
Beginning balance   $ 17,593
Warranty reserve related to acquisitions 3,951  
Warranty expense 8,493  
Warranty claims (10,897)  
Ending balance $ 19,140 $ 17,593