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Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | $ 24,468 | $ 21,313 | $ 22,007 | $ 22,587
Valuation Allowances and Reserves, Charged to Cost and Expense |  | 10,854 | 8,466 | 5,888 |
Valuation Allowances and Reserves, Charged to Other Accounts |  | 0 | 0 | 21 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | [1] | $ (7,699) | $ (9,160) | $ (6,489) |
[1] | (1) Represents allowance for doubtful accounts in connection with certain acquisitions and divestitures.

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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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