Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue
Net Sales	$ 71,681	$ 70,987	$ 205,448	$ 187,298
Operating Segments | U.S. Debit and Credit
Disaggregation of Revenue
Net Sales	51,502	48,002	151,517	128,992
Operating Segments | U.S. Prepaid Debit
Disaggregation of Revenue
Net Sales	20,452	21,190	53,162	52,128
Operating Segments | Other
Disaggregation of Revenue
Net Sales		1,920	1,679	7,599
Intersegment eliminations
Disaggregation of Revenue
Net Sales	(273)	(125)	(910)	(1,421)
Products
Disaggregation of Revenue
Net Sales	33,963	34,673	99,845	90,911
Products | Operating Segments | U.S. Debit and Credit
Disaggregation of Revenue
Net Sales	34,218	34,176	100,338	88,340
Products | Operating Segments | Other
Disaggregation of Revenue
Net Sales		549	397	3,549
Products | Intersegment eliminations
Disaggregation of Revenue
Net Sales	(255)	(52)	(890)	(978)
Services
Disaggregation of Revenue
Net Sales	37,718	36,314	105,603	96,387
Services | Operating Segments | U.S. Debit and Credit
Disaggregation of Revenue
Net Sales	17,284	13,826	51,179	40,652
Services | Operating Segments | U.S. Prepaid Debit
Disaggregation of Revenue
Net Sales	20,452	21,190	53,162	52,128
Services | Operating Segments | Other
Disaggregation of Revenue
Net Sales		1,371	1,282	4,050
Services | Intersegment eliminations
Disaggregation of Revenue
Net Sales	$ (18)	$ (73)	$ (20)	$ (443)