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Revenue Recognition - Reserves for Variable Consideration and Credit Risk (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Roll forward of the variable consideration and allowances for accounts receivable |  |  |
Balance at beginning of year | $ 5,252 | $ 3,454 |
Increases to reserves | 3,675 | 5,447 |
Amounts written off | (5,173) | (3,660) |
Effects of foreign currency translation | 10 | 11 |
Balance at end of year | 3,764 | 5,252 | $ 3,454
Roll forward of the variable consideration and allowances for unbilled services |  |  |
Balance at beginning of year | 704 | 474 |
Increases to reserves | 4,755 | 2,459 |
Amounts written off | (5,042) | (2,235) |
Effects of foreign currency translation | (2) | 6 |
Balance at end of year | 415 | 704 | 474
Bad debt expense | (1,410) | 1,739 | 535
Reimbursable expenses | 48,817 | 41,465 | 34,482
Selling, general and administrative expenses |  |  |
Roll forward of the variable consideration and allowances for unbilled services |  |  |
Bad debt expense | $ 1,200 | $ 0 | $ 1,100

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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