Revenue - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts, balance at beginning of period	$ 8,171	$ 4,069	$ 2,513
Bad debt expense	20,633	11,819	10,870
Actual write-offs	(9,022)	(7,717)	(9,314)
Allowance for doubtful accounts, balance at end of period	$ 8,171	$ 4,069	$ 2,513	$ 19,782