Business Acquisitions (Net Assets Acquired) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Recognized controlling ownership of joint venture	$ 23,264	$ 27,778	$ 11,293
Goodwill	317,410	233,095
ItzCash, EbixMoney,Transcorp, Via, Centrum, SmartClass, Indus, Mercury, Miles, Leisure, Weizmann, Wahh Taxis, Lawson, Routier, Business Travels and Pearl
Business Acquisition [Line Items]
Cash	250,769
Upfront cash consideration payable upon certain conditions being met	72,933
Contingent earn-out consideration arrangement asset	(5,137)
Business Combination, Contingent Consideration deposited in escrow account	0
Total consideration transferred	318,565
Recognized controlling ownership of joint venture	23,500
Business Combination, Equity Components Recorded	23,500
Business Combination, Total consideration transferred and equity components recorded	342,065
Cash	18,212
Short term investments acquired from Acquisition	0
Restricted Cash Acquired from Acquisition	0
Current assets	68,317
Property and equipment	2,176
Other assets	14,574
Intangible assets, definite lived	14,577
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capitalized Software Costs	46
Deferred tax asset	854
Current and other liabilities	(83,021)
Net assets acquired	35,735
Goodwill	306,330
Total net assets acquired	$ 342,065
Oakstone, EbixHealth JV, IHAC(Hope), WDEV [Member], Itzcash, beBetter, Youirst, Wallstreet, Paul Merchants, and Via
Business Acquisition [Line Items]
Cash		211,143
Upfront cash consideration payable upon certain conditions being met		0
Contingent earn-out consideration arrangement liability		30,149
Business Combination, Contingent Consideration deposited in escrow account		4,040
Total consideration transferred		245,332
Recognized controlling ownership of joint venture		27,625
Business Combination, Equity Components Recorded		27,625
Business Combination, Total consideration transferred and equity components recorded		272,957
Cash		18,982
Short term investments acquired from Acquisition		24,206
Restricted Cash Acquired from Acquisition		4,040
Current assets		39,680
Property and equipment		1,018
Other assets		1,683
Intangible assets, definite lived		11,267
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets		11,168
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capitalized Software Costs		1,705
Deferred tax liability		(3,405)
Current and other liabilities		(58,324)
Net assets acquired		52,020
Goodwill		220,937
Total net assets acquired		$ 272,957