Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 519,829	$ 524,025	$ 476,867	$ 437,894	$ 470,579	$ 481,373	$ 425,148	$ 395,162	$ 1,958,615	$ 1,772,262	$ 1,664,150
Direct operating costs									1,174,545	1,081,849	1,033,479
Salaries and benefits									288,420	259,162	243,220
Selling, general and administrative									165,348	156,385	157,265
Depreciation and amortization									80,529	70,025	71,455
Total operating expenses									1,708,842	1,567,421	1,505,419
Operating income	58,106	$ 90,468	$ 59,310	$ 41,889	55,224	$ 70,274	$ 47,180	$ 32,163	249,773	204,841	158,731
Interest income									1,696	2,170	2,549
Interest expense									(28,332)	(24,814)	(12,330)
Other gains									19,956	315	(1,801)
Foreign currency exchange (loss) gain, net									(10,200)	(41,418)	(5,646)
Other expense, net									(16,880)	(63,747)	(17,228)
Income before income taxes									232,893	141,094	141,503
Property and Equipment, net	202,145				157,368				202,145	157,368	125,307
Total Assets	2,712,872				2,192,714				2,712,872	2,192,714	2,038,447
Eft Processing Segment [Member]
Segment Reporting Information [Line Items]
Revenues									464,254	379,523	358,636
Direct operating costs									224,793	182,136	163,590
Salaries and benefits									51,822	45,364	47,148
Selling, general and administrative									30,399	25,822	25,730
Depreciation and amortization									40,084	31,807	30,847
Total operating expenses									347,098	285,129	267,315
Operating income									117,156	94,394	91,321
Property and Equipment, net	139,161				99,798				139,161	99,798	72,749
Total Assets	786,166				469,351				786,166	469,351	390,394
Epay Segment [Member]
Segment Reporting Information [Line Items]
Revenues									693,986	708,373	783,781
Direct operating costs									528,774	542,747	607,866
Salaries and benefits									51,378	49,752	56,402
Selling, general and administrative									34,517	38,272	42,542
Depreciation and amortization									11,075	11,163	15,901
Total operating expenses									625,744	641,934	722,711
Operating income									68,242	66,439	61,070
Property and Equipment, net	23,939				24,834				23,939	24,834	24,859
Total Assets	733,514				646,000				733,514	646,000	753,962
Money Transfer Segment [Member]
Segment Reporting Information [Line Items]
Revenues									801,919	685,635	523,150
Direct operating costs									422,508	358,154	263,253
Salaries and benefits									155,471	137,077	115,419
Selling, general and administrative									93,219	85,096	77,305
Depreciation and amortization									29,195	26,650	24,432
Total operating expenses									700,393	606,977	480,409
Operating income									101,526	78,658	42,741
Property and Equipment, net	38,954				32,591				38,954	32,591	27,528
Total Assets	1,136,722				1,040,737				1,136,722	1,040,737	835,977
Unallocated Amount to Segment, Intersegment Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Revenues									(1,544)	(1,269)	(1,417)
Direct operating costs									(1,530)	(1,188)	(1,230)
Salaries and benefits									29,749	26,969	24,251
Selling, general and administrative									7,213	7,195	11,688
Depreciation and amortization									175	405	275
Total operating expenses									35,607	33,381	34,984
Operating income									(37,151)	(34,650)	(36,401)
Property and Equipment, net	91				145				91	145	171
Total Assets	56,470				36,626				56,470	36,626	58,114
UNITED STATES
Segment Reporting Information [Line Items]
Revenues									548,877	529,467	440,166
Property and Equipment, net	25,837				24,693				25,837	24,693
Total Assets	373,303				350,583				373,303	350,583
Foreign Tax Authority [Member]
Segment Reporting Information [Line Items]
Revenues									1,409,738	1,242,795	1,223,984
Property and Equipment, net	176,308				132,675				176,308	132,675
Total Assets	2,339,569				1,842,131				2,339,569	1,842,131
AUSTRALIA
Segment Reporting Information [Line Items]
Revenues									77,198	77,643	89,430
Property and Equipment, net	3,153				2,434				3,153	2,434
Total Assets	82,377				89,538				82,377	89,538
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues									131,826	124,485	124,839
Property and Equipment, net	15,279				5,600				15,279	5,600
Total Assets	422,298				315,347				422,298	315,347
GERMANY
Segment Reporting Information [Line Items]
Revenues									409,590	377,170	389,060
Property and Equipment, net	16,852				14,946				16,852	14,946
Total Assets	404,733				347,893				404,733	347,893
POLAND
Segment Reporting Information [Line Items]
Revenues									115,269	105,129	113,837
Property and Equipment, net	60,027				57,287				60,027	57,287
Total Assets	187,686				106,691				187,686	106,691
SPAIN
Segment Reporting Information [Line Items]
Revenues									82,921	62,086	59,949
Property and Equipment, net	13,796				9,756				13,796	9,756
Total Assets	95,304				74,598				95,304	74,598
NEW ZEALAND
Segment Reporting Information [Line Items]
Revenues									40,890	56,735	32,967
Property and Equipment, net	2,810				2,382				2,810	2,382
Total Assets	203,300				163,574				203,300	163,574
ITALY
Segment Reporting Information [Line Items]
Revenues									72,591	56,896	58,970
Property and Equipment, net	7,285				3,596				7,285	3,596
Total Assets	110,888				88,683				110,888	88,683
MALAYSIA
Segment Reporting Information [Line Items]
Revenues									53,787	28,518	0
Property and Equipment, net	3,471				3,293				3,471	3,293
Total Assets	129,023				114,547				129,023	114,547
INDIA
Segment Reporting Information [Line Items]
Revenues									75,243	78,783	72,736
Property and Equipment, net	7,907				5,518				7,907	5,518
Total Assets	66,741				62,409				66,741	62,409
Other geographic locations [Member]
Segment Reporting Information [Line Items]
Revenues									350,423	275,350	$ 282,196
Property and Equipment, net	45,728				27,863				45,728	27,863
Total Assets	$ 637,219				$ 478,851				$ 637,219	$ 478,851