Consolidated Condensed Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Lease and rental revenues	$ 767,754	$ 729,024
Services revenue	759,127	693,704
Fuel services revenue	102,791	144,425
Total revenues	1,629,672	1,567,153
Cost of lease and rental	552,490	518,422
Cost of services	631,714	582,330
Cost of fuel services	98,901	136,289
Other operating expenses	30,151	32,373
Selling, general and administrative expenses	211,213	206,605
Gains on used vehicles, net	(19,129)	(27,208)
Interest expense	37,889	36,802
Miscellaneous income, net	(2,265)	(2,637)
Total expenses	1,540,964	1,482,976
Earnings from continuing operations before income taxes	88,708	84,177
Provision for income taxes	32,523	30,851
Earnings from continuing operations	56,185	53,326
Loss from discontinued operations, net of tax	(391)	(537)
Net earnings	$ 55,794	$ 52,789
Earnings (loss) per common share — Basic
Continuing operations (in dollars per share)	$ 1.06	$ 1.01
Discontinued operations (in dollars per share)	(0.01)	(0.01)
Net earnings (in dollars per share)	1.05	1.00
Earnings (loss) per common share — Diluted
Continuing operations (in dollars per share)	1.05	1.00
Discontinued operations (in dollars per share)	(0.01)	(0.01)
Net earnings (in dollars per share)	1.04	0.99
Cash dividends declared per common share (in dollars per share)	$ 0.41	$ 0.37