Summary of Significant Accounting Policies - Schedule of Revenue by Product (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 Information [Line Items]
Revenues, net	$ 514,953	$ 484,426	$ 417,905	$ 414,262	$ 430,601	$ 451,493	$ 404,605	$ 416,166	$ 1,831,546	$ 1,702,865	$ 1,199,390
Fuel cards
Segment Reporting Information [Line Items]
Revenues, net									1,124,000	1,116,000
Gift
Segment Reporting Information [Line Items]
Revenues, net									185,000	170,000
Corporate payments
Segment Reporting Information [Line Items]
Revenues, net									180,000	162,000
Tolls
Segment Reporting Information [Line Items]
Revenues, net									103,000	9,000
Lodging
Segment Reporting Information [Line Items]
Revenues, net									101,000	92,000
Other
Segment Reporting Information [Line Items]
Revenues, net									$ 140,000	$ 154,000