Segment Reporting - Revenue and EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting
Revenues	$ 67,380	$ 81,202	$ 73,725	$ 86,393	$ 93,567	$ 107,697	$ 95,536	$ 77,310	$ 308,700	$ 374,110	$ 261,006
EBITDA									45,512	83,401	47,023
Operating Segments | U.S. Debit and Credit
Segment Reporting
Revenues									208,795	263,668	153,015
EBITDA									52,090	78,981	37,547
Operating Segments | U.S. Prepaid Debit
Segment Reporting
Revenues									60,065	65,878	59,271
EBITDA									18,646	22,993	18,654
Operating Segments | U.K. Limited
Segment Reporting
Revenues									29,689	34,361	35,163
EBITDA									2,839	3,572	2,943
Operating Segments | Other
Segment Reporting
Revenues									13,110	17,420	23,908
EBITDA									(28,063)	(22,145)	(12,121)
Intersegment eliminations
Segment Reporting
Revenues									$ (2,959)	$ (7,217)	$ (10,351)