Consolidated Condensed Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Statement [Abstract]
Lease and rental revenues	$ 675,623	$ 634,717	$ 1,313,481	$ 1,214,132
Service revenue	675,533	640,482	1,353,885	1,273,220
Fuel services revenue	212,704	238,145	432,770	451,368
Total revenues	1,563,860	1,513,344	3,100,136	2,938,720
Cost of lease and rental	475,367	429,196	930,997	837,711
Cost of services	562,412	533,624	1,140,360	1,071,481
Cost of fuel services	209,337	233,451	424,910	442,411
Other operating expenses	33,664	30,174	67,913	64,803
Selling, general and administrative expenses	190,434	195,168	386,453	368,277
Gains on vehicle sales, net	(22,546)	(15,658)	(44,537)	(28,007)
Interest expense	35,622	32,974	70,387	67,393
Miscellaneous income, net	(1,341)	(595)	(5,821)	(4,737)
Restructuring and other charges, net	7,142	0	8,007	768
Total expenses	1,490,091	1,438,334	2,978,669	2,820,100
Earnings from continuing operations before income taxes	73,769	75,010	121,467	118,620
Provision for income taxes	27,002	34,096	39,824	51,849
Earnings from continuing operations	46,767	40,914	81,643	66,771
Loss from discontinued operations, net of tax	(44)	(881)	(599)	(1,613)
Net earnings	46,723	40,033	81,044	65,158
Earnings (loss) per common share - Basic
Continuing operations	$ 0.92	$ 0.80	$ 1.60	$ 1.30
Discontinued operations	$ 0.00	$ (0.02)	$ (0.01)	$ (0.03)
Net earnings	$ 0.92	$ 0.78	$ 1.59	$ 1.27
Earnings (loss) per common share - Diluted
Continuing operations	$ 0.91	$ 0.79	$ 1.59	$ 1.29
Discontinued operations	$ 0.00	$ (0.02)	$ (0.01)	$ (0.03)
Net earnings	$ 0.91	$ 0.77	$ 1.58	$ 1.26
Comprehensive income	$ 31,841	$ 42,854	$ 93,653	$ 95,278
Cash dividends declared per common share	$ 0.29	$ 0.27	$ 0.58	$ 0.54