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Deferred Costs and Other Contract Assets Deferred Costs and Other Contract Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Dec. 29, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]          
Prepaid contract allowances $ 5,872   $ 5,872   $ 7,036
Deferred commissions 5,121   5,121   5,085
Unbilled contract receivables 2,396   2,396   5,567
Equipment leased to customers, net(1) 431   431   108,417
Total deferred costs and other contract assets 13,820   13,820   126,105
Deferred Cost of Goods Sold, Amortization 200 $ 7,400 800 $ 22,200  
Deferred Cost of Goods Sold, Accumulated Amortization 1,100   1,100   $ 103,100
Amortization of Other Deferred Charges 600 500 1,800 1,300  
Amortization of Deferred Sales Commissions $ 500 $ 500 $ 1,500 $ 1,600