Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue
Net Sales	$ 66,901	$ 61,454	$ 133,767	$ 116,311
Operating Segments | U.S. Debit and Credit
Disaggregation of Revenue
Net Sales	51,086	43,843	100,015	80,991
Operating Segments | U.S. Prepaid Debit
Disaggregation of Revenue
Net Sales	15,966	15,427	32,710	30,938
Operating Segments | Other
Disaggregation of Revenue
Net Sales		2,980	1,679	5,679
Intersegment eliminations
Disaggregation of Revenue
Net Sales	(151)	(796)	(637)	(1,297)
Products
Disaggregation of Revenue
Net Sales	33,125	31,494	65,882	56,238
Products | Operating Segments | U.S. Debit and Credit
Disaggregation of Revenue
Net Sales	33,276	30,444	66,120	54,164
Products | Operating Segments | Other
Disaggregation of Revenue
Net Sales		1,625	397	3,000
Products | Intersegment eliminations
Disaggregation of Revenue
Net Sales	(151)	(575)	(635)	(926)
Services
Disaggregation of Revenue
Net Sales	33,776	29,960	67,885	60,073
Services | Operating Segments | U.S. Debit and Credit
Disaggregation of Revenue
Net Sales	17,810	13,399	33,895	26,827
Services | Operating Segments | U.S. Prepaid Debit
Disaggregation of Revenue
Net Sales	$ 15,966	15,427	32,710	30,938
Services | Operating Segments | Other
Disaggregation of Revenue
Net Sales		1,355	1,282	2,679
Services | Intersegment eliminations
Disaggregation of Revenue
Net Sales		$ (221)	$ (2)	$ (371)