Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Amortization Expense Associated with Commissions Asset and Intake Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Intake Costs asset
Capitalized Contract Cost [Line Items]
Amortization expense	$ 2,802	$ 2,835	$ 5,581	$ 5,514
Capitalized commissions asset
Capitalized Contract Cost [Line Items]
Amortization expense	$ 6,017	$ 5,935	$ 11,642	$ 9,881