Segment Information - Selected Financial Data, Revenues and Long lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 316,914	$ 315,883	$ 903,769	$ 907,278
Long-lived assets
Long-lived assets	2,108,180		2,108,180		$ 2,174,513
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	199,195	199,209	587,002	611,383
Long-lived assets
Long-lived assets	1,383,348		1,383,348		1,423,862
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	117,719	116,674	316,767	295,895
Long-lived assets
Long-lived assets	724,832		724,832		$ 750,651
License
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	54,454	56,773	110,383	135,038
Maintenance
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	53,519	53,049	159,037	159,078
Banks
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	131,744	125,658	341,712	356,865
Banks | Software as a service and platform as a service
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	14,794	13,881	43,555	41,036
Banks | License
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	51,062	48,997	102,993	123,735
Banks | Maintenance
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	48,829	48,331	146,091	145,973
Banks | Services
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	17,059	14,449	49,073	46,121
Merchants
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	38,989	40,761	115,083	109,870
Merchants | Software as a service and platform as a service
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	30,561	27,099	93,336	82,648
Merchants | License
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	3,392	7,776	7,296	11,209
Merchants | Maintenance
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	4,610	4,643	12,705	12,864
Merchants | Services
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	426	1,243	1,746	3,149
Billers
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	146,181	149,464	446,974	440,543
Billers | Software as a service and platform as a service
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	146,101	149,389	446,639	440,208
Billers | License
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	94	94
Billers | Maintenance
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	80	75	241	241
Billers | Services
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0