Accounts Receivable - Company's Accounts Receivable and Securitized Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	$ 2,231,884	$ 2,610,824
Less allowance for credit losses	(74,828)	(70,890)	$ (66,194)	$ (59,963)
Net accounts and securitized accounts receivable	2,157,056	2,539,934
Gross domestic accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	694,485	734,410
Gross domestic securitized accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	819,000	970,973
Gross foreign receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	$ 718,399	$ 905,441