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Summary of Significant Accounting Policies (Allowance for doubtful accounts) (Details) - Allowance for doubtful accounts - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 1,904 | $ 2,140 | $ 4,287
Adjustments to allowance | 2,440 | 846 | (357)
Amounts written off, net of recoveries and other adjustments | 477 | 1,082 | 1,598
Divestitures | 0 | 0 | 192
Balance at end of period | $ 3,867 | $ 1,904 | $ 2,140

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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