Consolidated Condensed Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Lease and rental revenues	$ 803,006	$ 802,881	$ 2,369,147	$ 2,310,951
Services revenue	801,004	734,803	2,345,922	2,165,677
Fuel services revenue	120,408	131,382	342,765	422,522
Total revenues	1,724,418	1,669,066	5,057,834	4,899,150
Cost of lease and rental	557,901	550,541	1,665,693	1,600,271
Cost of services	658,793	606,364	1,936,636	1,792,182
Cost of fuel services	116,904	129,562	331,283	408,027
Other operating expenses	27,997	26,957	85,944	88,912
Selling, general and administrative expenses	198,805	203,093	632,466	624,566
Gains on used vehicles, net	(1,873)	(24,965)	(33,002)	(82,158)
Interest expense	37,440	38,986	112,597	114,863
Miscellaneous income, net	(3,247)	(1,372)	(10,968)	(5,037)
Total expenses	1,592,720	1,529,166	4,720,649	4,541,626
Earnings from continuing operations before income taxes	131,698	139,900	337,185	357,524
Provision for income taxes	46,560	49,089	121,820	127,470
Earnings from continuing operations	85,138	90,811	215,365	230,054
Loss from discontinued operations, net of tax	(386)	(192)	(1,069)	(1,487)
Net earnings	$ 84,752	$ 90,619	$ 214,296	$ 228,567
Earnings (loss) per common share — Basic
Continuing operations (in dollars per share)	$ 1.60	$ 1.71	$ 4.05	$ 4.35
Discontinued operations (in dollars per share)	(0.01)	0.00	(0.02)	(0.03)
Net earnings (in dollars per share)	1.60	1.71	4.03	4.32
Earnings (loss) per common share — Diluted
Continuing operations (in dollars per share)	1.59	1.70	4.02	4.31
Discontinued operations (in dollars per share)	(0.01)	0.00	(0.02)	(0.03)
Net earnings (in dollars per share)	1.59	1.69	4.00	4.28
Cash dividends declared per common share (in dollars per share)	$ 0.44	$ 0.41	$ 1.26	$ 1.15