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Revenues - Deferred Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 29, 2020
Mar. 31, 2019
Change in Contract with Customer, Liability [Abstract]    
Beginning balance $ 70,070 $ 72,358
New deferrals 23,830 26,033
Revenue recognized (24,415) (32,168)
Ending balance $ 69,485 $ 66,223