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Other Assets - Loan to Service Provider Partners (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Jul. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total revenue	$ 188,857	$ 141,637	$ 361,355	$ 293,576
Service Provider | Loan Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, maximum available						$ 2,500
Debt instrument, interest rate						9.00%
Loan balance	1,200		1,200		$ 1,200
Total revenue	$ 100	$ 100	$ 100	$ 100

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