Segment Reporting - Revenue and EBITDA from Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting
Revenue	$ 66,901	$ 61,454	$ 133,767	$ 116,311
EBITDA	13,035	7,157	20,888	9,910
U.S. Debit and Credit
Segment Reporting
EBITDA	10,590	9,933	20,970	15,651
U.S. Prepaid Debit
Segment Reporting
EBITDA	5,880	4,687	11,659	9,506
Other
Segment Reporting
EBITDA	(3,435)	(7,463)	(11,741)	(15,247)
Operating Segments | U.S. Debit and Credit
Segment Reporting
Revenue	51,086	43,843	100,015	80,991
Operating Segments | U.S. Prepaid Debit
Segment Reporting
Revenue	15,966	15,427	32,710	30,938
Operating Segments | Other
Segment Reporting
Revenue		2,980	1,679	5,679
Intersegment eliminations
Segment Reporting
Revenue	$ (151)	$ (796)	$ (637)	$ (1,297)