Accounts and Other Receivables - Company's Accounts Receivable and Securitized Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	$ 2,021,707	$ 2,610,824
Less allowance for credit losses	(88,364)	(70,890)	$ (68,334)	$ (59,963)
Net accounts and other receivables and securitized accounts receivable	1,933,343	2,539,934
Gross domestic accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	703,590	734,410
Gross domestic securitized accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	654,000	970,973
Gross foreign receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	$ 664,117	$ 905,441