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Related Parties - Revenues and Expenses (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue
Total revenue		$ 222,471	$ 239,572	$ 659,599	$ 678,103
Expenses
Cost of revenue (exclusive of depreciation and amortization expenses)	[1]	163,126	181,761	493,071	521,748
Selling, general and administrative expenses	[1]	51,292	52,366	152,582	151,749
Affiliated Entity
Expenses
Cost of revenue (exclusive of depreciation and amortization expenses)		751	(63)	1,850	1,013
Selling, general and administrative expenses		74	0	186	97
Transformation services
Revenue
Total revenue	[1]	2,075	4,807	4,984	10,800
Transformation services | Affiliated Entity
Revenue
Total revenue		0	3,716	0	5,416
Platform and operations services
Revenue
Total revenue	[1]	220,396	234,765	654,615	667,303
Platform and operations services | Affiliated Entity
Revenue
Total revenue		$ 9,775	$ 72,383	$ 35,718	$ 214,216
[1] See Note 19 for amounts attributable to unconsolidated related parties included in these line items.

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