Accounts Receivable - Allowance for Doubtful Accounts Related to Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses beginning of period	$ 70,890	$ 59,963
Provision for credit losses	117,746	22,164
Write-offs	(113,808)	(15,933)
Allowance for credit losses end of period	$ 74,828	$ 66,194