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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

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