Segment Information (Reportable Segment Results) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Total revenues	$ 141,272	$ 91,435	$ 261,362	$ 175,281
Operating interest expense	1,461	1,429	2,739	2,871
Depreciation and amortization			23,139	12,067
Income taxes	23,248	18,021	30,179	29,154
Adjusted net income	35,545	26,792	64,711	50,466
Fleet Payment Solutions [Member]
Total revenues	113,648	78,385	212,182	151,795
Operating interest expense	1,218	1,221	2,238	2,449
Depreciation and amortization	5,115	4,351	10,136	8,797
Income taxes	16,061	14,117	29,688	26,772
Adjusted net income	28,800	23,530	53,237	44,622
Other Payment Solutions [Member]
Total revenues	27,624	13,050	49,180	23,486
Operating interest expense	243	208	501	422
Depreciation and amortization	414	68	797	123
Income taxes	3,761	1,958	6,397	3,508
Adjusted net income	6,745	3,262	11,474	5,844
Segment Reporting Total [Member]
Total revenues	141,272	91,435	261,362	175,281
Operating interest expense	1,461	1,429	2,739	2,871
Depreciation and amortization	5,529	4,419	10,933	8,920
Income taxes	19,822	16,075	36,085	30,280
Adjusted net income	$ 35,545	$ 26,792	$ 64,711	$ 50,466