Summary of Significant Accounting Policies and Practices Recently issued and adopted accounting pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by (Used in) Operating Activities									$ 504,488	$ 397,233	$ 286,276
Goodwill, Impairment Loss									0	0
Impairment of Intangible Assets, Finite-lived									0	7,049	2,300
Deferred Tax Assets, Gross	$ 278,621				$ 137,384				278,621	137,384
Deferred Tax Assets, Valuation Allowance	83,184				21,857				83,184	21,857
Revenues	693,747	$ 786,986	$ 691,867	$ 577,509	649,385	$ 714,505	$ 622,224	$ 550,515	2,750,109	2,536,629	2,252,422
Restricted cash	83,469				$ 76,595				83,469	76,595
Deferred Revenue, Additions									41,400
Deferred Revenue, Revenue Recognized									40,700
Operating Lease, Right-of-Use Asset	$ 377,543								377,543
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												$ 269,900
Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									888,712	753,651	634,559
Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									769,329	743,784	733,998
Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impairment of Intangible Assets, Finite-lived									0
Revenues									1,096,226	1,042,962	886,858
Consolidation, Eliminations [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									(4,158)	(3,768)	(2,993)
Europe [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									1,622,372	1,428,867	1,324,673
Europe [Member] | Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									724,163	608,993	501,161
Europe [Member] | Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									524,907	491,282	561,232
Europe [Member] | Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									373,302	328,592	262,280
North America [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									759,493	767,241	608,485
North America [Member] | Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									35,461	32,306	31,469
North America [Member] | Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									151,016	165,930	63,148
North America [Member] | Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									573,016	569,005	513,868
Asia Pacific [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									330,485	310,593	294,308
Asia Pacific [Member] | Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									129,060	112,294	101,787
Asia Pacific [Member] | Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									76,491	71,242	91,516
Asia Pacific [Member] | Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									124,934	127,057	101,005
Other geographic locations [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									41,917	33,696	27,949
Other geographic locations [Member] | Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									28	58	142
Other geographic locations [Member] | Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									16,915	15,330	18,102
Other geographic locations [Member] | Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									$ 24,974	$ 18,308	$ 9,705