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Accounts Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | $ 8,549,422 | $ 9,021,051
Allowances for doubtful accounts | (66,735) | (75,588)
Accounts receivable, net | $ 8,482,687 | $ 8,945,463

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