Accounts Receivable Factoring Receivables Factored and Costs Incurred (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Transfers and Servicing [Abstract]
Total amount of accounts receivable factored without recourse	$ 108,957	$ 149,136	$ 376,944	$ 518,808
Costs incurred on sale of receivables without recourse	$ 218	$ 348	$ 691	$ 1,065