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Valuation and Qualifying Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Allowance for Doubtful Accounts, Balance at beginning of year |  | $ 75,588 | $ 56,291 | $ 52,256
Allowance for doubtful accounts, Charged to Income |  | 26,220 | 34,936 | 12,887
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account | [1] | (681) | (1,958) | 2,831
Allowance for Doubtful Accounts, Write-down |  | 34,392 | 13,681 | 11,683
Allowance for Doubtful Accounts, Balance at end of year |  | $ 66,735 | $ 75,588 | $ 56,291
[1] | “Other” primarily includes the effect of fluctuations in foreign currencies and the allowance for doubtful accounts of the businesses acquired and disposed of by the company.

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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