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Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 7,906,758 $ 9,021,051
Allowances for doubtful accounts (64,907) (75,588)
Accounts receivable, net $ 7,841,851 $ 8,945,463