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Revenue - Revenue Contract Estimates (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 29, 2019
Mar. 30, 2018
Revenue from Contract with Customer [Abstract]    
Favorable adjustments $ 2,502 $ 4,152
Unfavorable adjustments (3,585) (1,311)
Net favorable adjustments (1,083) 2,841
Unfavorable adjustments to operating income $ 400  
Net favorable adjustment to operating income   $ (3,400)