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Segment Information - Revenue by Primary Solution Category for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 306,591	$ 316,914	$ 970,096	$ 903,769
Bill Payments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	153,543	146,181	465,368	446,974
Digital Business Banking
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	9,001	16,527	34,586	47,319
Merchant Payments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	35,609	38,989	113,145	115,083
Fraud Management
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	14,840	6,882	30,169	23,563
Real-Time Payments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	24,904	27,638	71,043	58,534
Issuing and Acquiring
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	68,694	80,697	255,785	212,296
License
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	43,661	54,454	168,260	110,383
Maintenance
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	49,163	53,519	151,143	159,037
Operating Segments | Banks
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	117,439	131,744	391,583	341,712
Operating Segments | Banks | Bill Payments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
Operating Segments | Banks | Digital Business Banking
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	9,001	16,527	34,586	47,319
Operating Segments | Banks | Merchant Payments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
Operating Segments | Banks | Fraud Management
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	14,840	6,882	30,169	23,563
Operating Segments | Banks | Real-Time Payments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	24,904	27,638	71,043	58,534
Operating Segments | Banks | Issuing and Acquiring
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	68,694	80,697	255,785	212,296
Operating Segments | Banks | Software as a service and platform as a service
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	12,394	14,794	40,331	43,555
Operating Segments | Banks | License
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	42,188	51,062	159,569	102,993
Operating Segments | Banks | Maintenance
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	44,896	48,829	138,983	146,091
Operating Segments | Banks | Services
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	17,961	17,059	52,700	49,073
Operating Segments | Merchants
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	35,609	38,989	113,145	115,083
Operating Segments | Merchants | Bill Payments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
Operating Segments | Merchants | Digital Business Banking
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
Operating Segments | Merchants | Merchant Payments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	35,609	38,989	113,145	115,083
Operating Segments | Merchants | Fraud Management
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
Operating Segments | Merchants | Real-Time Payments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
Operating Segments | Merchants | Issuing and Acquiring
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
Operating Segments | Merchants | Software as a service and platform as a service
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	29,626	30,561	91,451	93,336
Operating Segments | Merchants | License
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,473	3,392	8,691	7,296
Operating Segments | Merchants | Maintenance
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	4,244	4,610	12,090	12,705
Operating Segments | Merchants | Services
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	266	426	913	1,746
Operating Segments | Billers
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	153,543	146,181	465,368	446,974
Operating Segments | Billers | Bill Payments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	153,543	146,181	465,368	446,974
Operating Segments | Billers | Digital Business Banking
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
Operating Segments | Billers | Merchant Payments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
Operating Segments | Billers | Fraud Management
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
Operating Segments | Billers | Real-Time Payments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
Operating Segments | Billers | Issuing and Acquiring
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
Operating Segments | Billers | Software as a service and platform as a service
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	153,520	146,101	465,298	446,639
Operating Segments | Billers | License
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	94
Operating Segments | Billers | Maintenance
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	23	80	70	241
Operating Segments | Billers | Services
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0

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