Consolidated Condensed Statements of Earnings (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Lease and rental revenues	$ 733,763	$ 688,048	$ 1,423,445	$ 1,347,756
Services revenue	741,427	707,666	1,451,126	1,397,127
Fuel services revenue	209,381	208,285	420,737	422,133
Total revenues	1,684,571	1,603,999	3,295,308	3,167,016
Cost of lease and rental	508,091	476,662	1,001,134	949,739
Cost of services	625,276	590,311	1,231,505	1,173,900
Cost of fuel services	203,613	204,626	410,818	414,919
Other operating expenses	31,007	32,876	67,652	70,475
Selling, general and administrative expenses	200,430	195,033	392,132	384,106
Gains on vehicle sales, net	(34,365)	(23,197)	(63,183)	(46,203)
Interest expense	35,302	33,901	70,411	68,355
Miscellaneous income, net	(4,828)	(3,575)	(10,210)	(8,145)
Total expenses	1,564,526	1,506,637	3,100,259	3,007,146
Earnings from continuing operations before income taxes	120,045	97,362	195,049	159,870
Provision for income taxes	44,351	34,787	70,257	56,493
Earnings from continuing operations	75,694	62,575	124,792	103,377
Loss from discontinued operations, net of tax	(336)	(381)	(1,202)	(1,259)
Net earnings	$ 75,358	$ 62,194	$ 123,590	$ 102,118
Earnings (loss) per common share - Basic
Continuing operations	$ 1.43	$ 1.21	$ 2.36	$ 2.00
Discontinued operations	$ 0.00	$ (0.01)	$ (0.02)	$ (0.02)
Net earnings	$ 1.43	$ 1.20	$ 2.34	$ 1.98
Earnings (loss) per common share - Diluted
Continuing operations	$ 1.42	$ 1.19	$ 2.34	$ 1.98
Discontinued operations	$ (0.01)	$ 0.00	$ (0.02)	$ (0.02)
Net earnings	$ 1.41	$ 1.19	$ 2.32	$ 1.96
Cash dividends declared per common share	$ 0.34	$ 0.31	$ 0.68	$ 0.62