Geographic Information (Details)	3 Months Ended												12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) ProductService_Groups	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Reportable Segments | segment																1
Increase (decrease) in reported revenue														$ 133,900,000
Effect of Exchange Rate on Revenue														(6,900,000)			$ 2,100,000
Operating revenue	$ 136,327,000	$ 128,643,000	$ 124,626,000	$ 108,230,000	$ 104,681,000	$ 92,800,000	$ 87,387,000	$ 79,103,000	$ 80,046,000	$ 74,608,000	$ 72,574,000	$ 71,066,000		497,826,000			363,971,000	$ 298,294,000
Long-lived assets	1,183,567,000				860,081,000				596,709,000				$ 1,183,567,000	1,183,567,000	$ 1,183,567,000	$ 1,183,567,000	860,081,000	596,709,000
Goodwill, Purchase Accounting Adjustments														(7,500,000)			(7,300,000)	(6,800,000)
Number of operating segments															4	1
Increase (decrease) in reported revenue, percentage													36.80%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount														2,000,000			(3,700,000)
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Increase (decrease) in reported revenue														(14,900,000)
Operating revenue														196,984,000			211,895,000	213,516,000
Long-lived assets	390,551,000				394,112,000				385,723,000				$ 390,551,000	390,551,000	$ 390,551,000	$ 390,551,000	394,112,000	385,723,000
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Increase (decrease) in reported revenue														(1,900,000)			1,200,000
Operating revenue														5,611,000			7,522,000	6,328,000
Long-lived assets	5,846,000				6,601,000				6,411,000				5,846,000	5,846,000	5,846,000	5,846,000	6,601,000	6,411,000
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
Increase (decrease) in reported revenue														(1,300,000)			12,900,000
Effect of Exchange Rate on Revenue														(2,700,000)			1,400,000
Operating revenue														19,866,000			21,128,000	8,179,000
Long-lived assets	16,348,000				22,300,000				26,648,000				16,348,000	16,348,000	16,348,000	16,348,000	22,300,000	26,648,000
Long Lived Assets, Increase (Decrease)														(6,000,000)
Increase (Decrease) in Derivative Assets														(2,900,000)
Foreign currency translation related to long lived assets														(0.146)
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue														7,674,000			6,330,000	5,848,000
Long-lived assets	17,805,000				17,475,000				17,467,000				17,805,000	17,805,000	17,805,000	17,805,000	17,475,000	17,467,000
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue														2,015,000			1,933,000	1,903,000
Long-lived assets	158,000				247,000				215,000				158,000	158,000	158,000	158,000	247,000	215,000
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Increase (decrease) in reported revenue														134,500,000			47,700,000
Operating revenue	65,900,000													196,372,000			61,857,000	14,153,000
Long-lived assets	672,699,000				338,130,000				83,082,000				672,699,000	672,699,000	672,699,000	672,699,000	338,130,000	83,082,000
Long Lived Assets, Increase (Decrease)														334,600,000			255,000,000
Foreign currency translation related to long lived assets														(0.082)
Payment of deferred taxes																	4,100,000
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue														15,387,000			17,062,000	17,211,000
Long-lived assets	23,880,000				25,687,000				21,766,000				23,880,000	23,880,000	23,880,000	23,880,000	25,687,000	21,766,000
Long Lived Assets, Increase (Decrease)														(1,800,000)			(3,900,000)
Foreign currency translation related to long lived assets														(0.056)			$ 2,000,000
Foreign currency tranlated against US Dollar, percent																	9.30%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount																	$ 3,200,000
AUSTRALIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Increase (decrease) in reported revenue														1,400,000			3,200,000
Effect of Exchange Rate on Revenue														(922,000)			1,100,000
Operating revenue														35,770,000			34,366,000	31,156,000
Long-lived assets	1,485,000				1,174,000				1,245,000				1,485,000	1,485,000	1,485,000	1,485,000	1,174,000	1,245,000
INDONESIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue														7,482,000			1,055,000	0
Long-lived assets	98,000				110,000				0				98,000	98,000	98,000	98,000	110,000	0
PHILIPPINES
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue														6,483,000			623,000	0
Long-lived assets	448,000				616,000				0				448,000	448,000	448,000	448,000	616,000	0
UNITED ARAB EMIRATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue														1,042,000			200,000	0
Long-lived assets	54,249,000				53,629,000				54,152,000				54,249,000	54,249,000	54,249,000	54,249,000	53,629,000	54,152,000
MAURITIUS
Revenues from External Customers and Long-Lived Assets [Line Items]
Increase (decrease) in reported revenue														3,100,000
Operating revenue														3,140,000			0	0
Long-lived assets	$ 0				$ 0				$ 0				$ 0	$ 0	$ 0	$ 0	0	$ 0
e- governance contracts | India
Revenues from External Customers and Long-Lived Assets [Line Items]
Increase (decrease) in reported revenue																	5,300,000
ItzCash, Youfirst, WallStreet, PML, Via, and Transcorp | India
Revenues from External Customers and Long-Lived Assets [Line Items]
Increase (decrease) in reported revenue																	42,900,000
Increase In Value Of Long Lived Assets From Business Acquisitions																	$ 249,500,000