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Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
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