Recently Issued and Adopted Accounting Pronouncements New Accounting Pronouncements or Change in Accounting Principle (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by (Used in) Operating Activities			$ 192,573	$ 257,684
Deferred Revenue, Additions			36,000
Deferred Revenue, Revenue Recognized			35,000
Restricted cash	$ 73,453		73,453		$ 81,374
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	16,400		53,300
Accounting Standards Update 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by (Used in) Operating Activities			27,200
Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	261,736	$ 226,321	592,333	488,030
Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	185,431	184,234	528,739	512,531
Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	268,291	228,105	768,943	649,205
North America [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	196,789	155,313	569,191	451,125
North America [Member] | Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	7,613	8,065	23,956	23,065
North America [Member] | Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	41,346	15,633	124,667	48,440
North America [Member] | Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	147,830	131,615	420,568	379,620
Europe [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	434,409	403,510	1,065,476	963,609
Europe [Member] | Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	226,531	192,147	485,030	391,213
Europe [Member] | Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	123,386	141,561	340,180	382,316
Europe [Member] | Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	84,492	69,802	240,266	190,080
Asia Pacific [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	76,270	72,634	230,475	214,649
Asia Pacific [Member] | Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	27,570	25,977	83,310	73,614
Asia Pacific [Member] | Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	17,505	22,556	52,116	68,291
Asia Pacific [Member] | Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	31,195	24,101	95,049	72,744
Other geographic locations [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	7,990	7,203	24,873	20,383
Other geographic locations [Member] | Eft Processing Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	22	132	37	138
Other geographic locations [Member] | Epay Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	3,194	4,484	11,776	13,484
Other geographic locations [Member] | Money Transfer Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	4,774	2,587	13,060	6,761
Consolidation, Eliminations [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	$ (953)	$ (826)	$ (2,771)	$ (1,989)