Revenue Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts, balance at beginning of period	$ 8,171	$ 4,069
Bad debt expense	17,399	11,819
Actual write-offs	(7,501)	(7,717)
Allowance for doubtful accounts, balance at end of period	$ 8,171	$ 4,069	$ 18,069