Geographic Information (Details) $ in Thousands	3 Months Ended												12 Months Ended
	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, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) Reportable_Segments	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jul. 01, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Goodwill, Purchase Accounting Adjustments													$ (7,300)	$ (6,800)	$ (7,200)
Number of reportable segments | Reportable_Segments													1
External Revenues	$ 104,681	$ 92,800	$ 87,387	$ 79,103	$ 80,046	$ 74,608	$ 72,574	$ 71,066	$ 70,204	$ 66,813	$ 64,712	$ 63,753	$ 363,971	298,294	265,482
Long-lived assets	860,081				596,709				559,159				860,081	596,709	559,159
Effect of Exchange Rate on Revenue													2,100	(3,300)
Increase (decrease) in reported revenue													$ 65,700
Increase (decrease) in reported revenue, percentage													22.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount													$ (3,700)	(2,200)
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Equity Method Investment, Ownership Percentage																51.00%
Goodwill, Purchase Accounting Adjustments														(4,700)
External Revenues													211,895	213,516	205,210
Long-lived assets	394,112				385,723				374,432				394,112	385,723	374,432
Long Lived Assets, Increase (Decrease)														11,300
Goodwill, Translation and Purchase Accounting Adjustments														14,600
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													7,522	6,328	4,490
Long-lived assets	6,601				6,411				6,632				6,601	6,411	6,632
Increase (decrease) in reported revenue													1,200
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													21,128	8,179	5,715
Long-lived assets	22,300				26,648				6,091				22,300	26,648	6,091
Effect of Exchange Rate on Revenue													1,400	(300)
Increase (decrease) in reported revenue													12,900
Long Lived Assets, Increase (Decrease)														17,700
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													6,330	5,848	5,317
Long-lived assets	17,475				17,467				68,852				17,475	17,467	68,852
Long Lived Assets, Increase (Decrease)														(51,400)
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													1,933	1,903	2,153
Long-lived assets	247				215				221				247	215	221
India
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													61,857	14,153	3,538
Long-lived assets	338,130				83,082				74,693				338,130	83,082	74,693
Increase (decrease) in reported revenue													47,700	$ 10,600
Increase (decrease) in reported revenue, percentage														300.00%
Long Lived Assets, Increase (Decrease)													255,000	$ 8,400
Payment of deferred taxes													4,100	4,800
Increase in value of long lived assets from continued product development														3,500
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													17,062	17,211	8,425
Long-lived assets	25,687				21,766				28,039				25,687	21,766	28,039
Effect of Exchange Rate on Revenue														(2,200)
Increase (decrease) in reported revenue														8,800
Long Lived Assets, Increase (Decrease)													$ (3,900)	$ (6,300)
Foreign currency tranlated against US Dollar, percent													9.30%	(16.60%)
Foreign currency translation related to long lived assets													$ 2,000	$ 4,300
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount													3,200
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													34,366	31,156	30,634
Long-lived assets	1,174				1,245				199				1,174	1,245	199
Effect of Exchange Rate on Revenue													1,100	(410)
Increase (decrease) in reported revenue													3,200
Dubai [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													0	0	0
Long-lived assets	53,599				54,152				0				53,599	54,152	0
Long Lived Assets, Increase (Decrease)														54,200
INDONESIA
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													1,055	0	0
Long-lived assets	110				0				0				110	0	0
PHILIPPINES
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													623	0	0
Long-lived assets	616				0				0				616	0	0
UNITED ARAB EMIRATES
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues													200	0	0
Long-lived assets	$ 30				$ 0				$ 0				30	$ 0	$ 0
e- governance contracts [Member] | India
Revenues from External Customers and Long-Lived Assets [Line Items]
Increase (decrease) in reported revenue													5,300
ItzCash, Youfirst, WallStreet, PML, and Via [Member] | India
Revenues from External Customers and Long-Lived Assets [Line Items]
Increase (decrease) in reported revenue													42,900
Increase In Value Of Long Lived Assets From Business Acquisitions													$ 249,500