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Revenue Revenue (Tables)
6 Months Ended
Jun. 28, 2019
Revenue from Contract with Customer [Abstract]  
Contract assets and Deferred Revenue
Contract assets and deferred revenue consisted of the following (in thousands):
 
As of
 
June 28,
2019
 
December 31,
2018
Contract assets
$
4,163

 
$
3,834

Deferred revenue
51,891

 
46,922