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Revenue Recognition Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Distributor sales accruals [Line Items]            
Beginning Balance $ 38,032 $ 35,733 $ 36,680 $ 34,479 $ 34,479 $ 32,487
Sales allowances 27,986 22,421 77,539 67,191 89,009 86,896
Credits issued (29,293) (28,116) (77,091) (71,638) (87,403) (85,341)
Foreign currency 103 384 (300) 390 595 437
Ending Balance $ 36,828 $ 30,422 $ 36,828 $ 30,422 $ 36,680 $ 34,479