Summary of Significant Accounting Policies and Practices Recently issued and adopted accounting pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 397,233	$ 286,276	$ 391,524
Goodwill, Impairment Loss	0	31,770
Impairment of Intangible Assets, Finite-lived	7,049	2,286
Deferred Tax Assets, Gross	139,259	128,383
Deferred Tax Assets, Valuation Allowance	21,857	20,257
Restricted cash	76,595	81,374
Deferred Revenue, Additions	52,900
Deferred Revenue, Revenue Recognized	45,600
Accounting Standards Update 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by (Used in) Operating Activities		(5,000)	23,300
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	88,500
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset				$ 375,000
Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	753,651	634,559	464,254
Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	743,784	733,998	693,986
Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	1,042,962	886,858	801,919
Europe [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	1,428,867	1,324,673	1,078,600
Europe [Member] | Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	608,993	501,161	343,932
Europe [Member] | Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	491,282	561,232	498,668
Europe [Member] | Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	328,592	262,280	236,000
North America [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	767,241	608,485	580,273
North America [Member] | Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	32,306	31,469	28,070
North America [Member] | Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	165,930	63,148	81,983
North America [Member] | Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	569,005	513,868	470,220
Asia Pacific [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	310,593	294,308	277,563
Asia Pacific [Member] | Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	112,294	101,787	92,252
Asia Pacific [Member] | Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	71,242	91,516	95,524
Asia Pacific [Member] | Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	127,057	101,005	89,787
Other geographic locations [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	33,696	27,949	23,723
Other geographic locations [Member] | Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	58	142	0
Other geographic locations [Member] | Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	15,330	18,102	17,811
Other geographic locations [Member] | Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	18,308	9,705	5,912
Consolidation, Eliminations [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	$ (3,768)	$ (2,993)	$ (1,544)