Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Contract Fulfillment Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Intake Costs asset
Contract With Customer, Asset And Liabilities [Line Items]
Gross Carrying Amount	$ 39,798	$ 41,224
Accumulated Amortization	(23,467)	(23,579)
Net Carrying Amount	16,331	17,645
Capitalized commissions asset
Contract With Customer, Asset And Liabilities [Line Items]
Gross Carrying Amount	67,752	68,008
Accumulated Amortization	(25,828)	(27,178)
Net Carrying Amount	$ 41,924	$ 40,830