Geographic Information (Revenue by Geographic Locations) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) Reportable_Segments	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Reportable_Segments	1
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net, Increase (Decrease)	$ 29,127,000
External Revenues	108,230,000	$ 79,103,000
Long-lived assets	871,577,000	598,166,000	$ 871,577,000
Increase (Decrease) in Deferred Income Taxes	1,874,000	850,000
Goodwill, Acquired During Period	7,254,000			$ 233,095,000
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net, Increase (Decrease)	(2,300,000)
External Revenues	49,902,000	52,179,000
Long-lived assets	396,775,000	385,474,000	396,775,000
Long Lived Assets, Increase (Decrease)			8,000,000
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net, Increase (Decrease)	(1,000)
External Revenues	1,600,000	2,108,000
Long-lived assets	6,381,000	6,389,000	6,381,000
BRAZIL
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net, Increase (Decrease)	1,500,000
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	5,394,000	3,899,000
Long-lived assets	22,499,000	24,374,000	22,499,000
Long Lived Assets, Increase (Decrease)			$ (1,900,000)
Foreign Currency Translation Gain (Loss), Percent			(4.80%)
Foreign Currency Translation Related To Long Lived Assets			$ (1,200,000)
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net, Increase (Decrease)	588
External Revenues	9,487,000	8,899,000
Long-lived assets	1,713,000	1,290,000	1,713,000
Effect of Exchange Rate on Revenue	300,000
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	2,216,000	1,731,000
Long-lived assets	17,950,000	17,457,000	17,950,000
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	487,000	480,000
Long-lived assets	289,000	216,000	289,000
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net, Increase (Decrease)	26,400,000
External Revenues	32,003,000	5,620,000
Long-lived assets	344,568,000	87,301,000	344,568,000
Long Lived Assets, Increase (Decrease)			257,300,000
Increase In Value Of Long Lived Assets From Business Acquisitions			253,200,000
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	4,031,000	4,187,000
Long-lived assets	27,317,000	21,696,000	27,317,000
Long Lived Assets, Increase (Decrease)			$ (5,600,000)
Foreign Currency Translation Gain (Loss), Percent			12.20%
Foreign Currency Translation Related To Long Lived Assets			$ 2,700,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			4,300,000
Dubai [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	4,000	0
Long-lived assets	53,396,000	53,969,000	53,396,000
INDONESIA
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	1,541,000	0
Long-lived assets	109,000	0	109,000
PHILIPPINES
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	1,348,000	0
Long-lived assets	550,000	0	550,000
UNITED ARAB EMIRATES
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	217,000	0
Long-lived assets	30,000	$ 0	$ 30,000
ItzCash, Youfirst, WallStreet, PML, Via, and Transcorp [Member] | India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net, Increase (Decrease)	25,000,000
e- governance contracts [Member] | India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net, Increase (Decrease)	$ 1,200,000