Segment Information - Schedule of Selected Financial Data by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,452,579	$ 1,421,901	$ 1,370,598
Depreciation and amortization	(122,373)	(127,328)	(133,393)
Stock-based compensation expense	(24,547)	(29,753)	(27,242)
Corporate and unallocated expenses	(174,849)	(166,501)	(185,731)
Interest, net	(64,271)	(40,646)	(33,538)
Other, net	(8,510)	43,446	(1,294)
Income before income taxes	147,627	206,635	175,065
Operating Segments | Banks
Segment Reporting Information [Line Items]
Revenues	616,051	638,585	625,125
Segment Adjusted EBITDA	355,489	371,017	372,949
Operating Segments | Merchants
Segment Reporting Information [Line Items]
Revenues	150,616	153,905	152,988
Segment Adjusted EBITDA	44,345	49,029	54,266
Operating Segments | Billers
Segment Reporting Information [Line Items]
Revenues	685,912	629,411	592,485
Segment Adjusted EBITDA	$ 142,343	$ 107,371	$ 129,048