Segment Information - Schedule of Segment Reporting Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Total revenue	$ 103,591	$ 110,946	$ 323,949	$ 305,649
Operating income (loss):
Income from operations	3,560	9,466	14,643	24,300
Depreciation and amortization:
Depreciation and amortization	4,899	3,602	12,679	11,254
Operating Segments
Revenues:
Total revenue	103,591	110,946	323,949	305,649
Operating income (loss):
Income from operations	3,560	9,466	14,643	24,300
Depreciation and amortization:
Depreciation and amortization	4,899	3,602	12,679	11,254
Operating Segments | Consumer Payments
Revenues:
Total revenue	95,801	104,334	302,514	287,129
Operating income (loss):
Income from operations	3,662	8,770	15,070	22,457
Depreciation and amortization:
Depreciation and amortization	4,724	3,520	12,268	10,983
Operating Segments | Commercial Payments and Managed Services
Revenues:
Total revenue	7,790	6,612	21,435	18,520
Operating income (loss):
Income from operations	(102)	696	(427)	1,843
Depreciation and amortization:
Depreciation and amortization	$ 175	$ 82	$ 411	$ 271