Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment			3
Revenues	$ 714,505	$ 637,834	$ 1,887,244	$ 1,647,777
Direct operating costs	388,236	364,815	1,093,072	978,768
Salaries and benefits	93,108	82,134	270,537	232,617
Selling, general and administrative	55,787	49,279	158,156	139,708
Intangible assets impairment	0	0	0	2,286
Depreciation and amortization	26,461	24,705	78,726	69,520
Total operating expenses	563,592	520,933	1,600,491	1,422,899
Operating income (expense)	150,913	116,901	286,753	224,878
Property, Plant and Equipment, Net	283,167		283,167		$ 268,303
Assets	3,460,786		3,460,786		3,140,029
Eft Processing Segment [Member]
Segment Reporting Information [Line Items]
Revenues	261,736	226,321	592,333	488,030
Direct operating costs	101,763	99,024	279,927	238,753
Salaries and benefits	21,653	16,817	57,704	46,125
Selling, general and administrative	11,227	8,878	30,557	23,960
Intangible assets impairment				2,286
Depreciation and amortization	16,694	14,805	49,277	39,816
Total operating expenses	151,337	139,524	417,465	350,940
Operating income (expense)	110,399	86,797	174,868	137,090
Property, Plant and Equipment, Net	209,912		209,912		196,451
Assets	1,460,848		1,460,848		1,040,135
Epay Segment [Member]
Segment Reporting Information [Line Items]
Revenues	185,431	184,234	528,739	512,531
Direct operating costs	142,665	143,023	403,010	393,269
Salaries and benefits	14,491	13,955	43,235	39,606
Selling, general and administrative	9,968	9,145	27,191	27,628
Intangible assets impairment				0
Depreciation and amortization	1,881	2,461	5,653	7,667
Total operating expenses	169,005	168,584	479,089	468,170
Operating income (expense)	16,426	15,650	49,650	44,361
Property, Plant and Equipment, Net	29,496		29,496		28,135
Assets	616,406		616,406		695,990
Money Transfer Segment [Member]
Segment Reporting Information [Line Items]
Revenues	268,291	228,105	768,943	649,205
Direct operating costs	144,758	123,588	412,895	348,724
Salaries and benefits	48,945	44,110	145,420	125,273
Selling, general and administrative	32,483	28,648	93,610	77,912
Intangible assets impairment				0
Depreciation and amortization	7,854	7,403	23,702	21,941
Total operating expenses	234,040	203,749	675,627	573,850
Operating income (expense)	34,251	24,356	93,316	75,355
Property, Plant and Equipment, Net	43,684		43,684		43,564
Assets	1,366,298		1,366,298		1,255,765
Corporate Services, Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Revenues	(953)	(826)	(2,771)	(1,989)
Direct operating costs	(950)	(820)	(2,760)	(1,978)
Salaries and benefits	8,019	7,252	24,178	21,613
Selling, general and administrative	2,109	2,608	6,798	10,208
Intangible assets impairment				0
Depreciation and amortization	32	36	94	96
Total operating expenses	9,210	9,076	28,310	29,939
Operating income (expense)	(10,163)	$ (9,902)	(31,081)	$ (31,928)
Property, Plant and Equipment, Net	75		75		153
Assets	$ 17,234		$ 17,234		$ 148,139