Consolidated Condensed Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Lease and rental revenues	$ 767,590	$ 767,754
Services revenue	851,867	759,127
Fuel services revenue	128,706	102,791
Total revenues	1,748,163	1,629,672
Cost of lease and rental	578,762	552,490
Cost of services	714,080	631,714
Cost of fuel services	125,850	98,901
Other operating expenses	31,271	30,151
Selling, general and administrative expenses	201,761	204,403
Non-service retirement benefit costs	7,330	6,810
Used vehicle sales, net	(780)	(19,129)
Interest expense	34,886	37,889
Miscellaneous income, net	(4,953)	(2,265)
Total expenses	1,688,207	1,540,964
Earnings from continuing operations before income taxes	59,956	88,708
Provision for income taxes	21,677	32,523
Earnings from continuing operations	38,279	56,185
Loss from discontinued operations, net of tax	(130)	(391)
Net earnings	$ 38,149	$ 55,794
Earnings (loss) per common share — Basic
Continuing operations (in dollars per share)	$ 0.72	$ 1.06
Discontinued operations (in dollars per share)	0.00	(0.01)
Net earnings (in dollars per share)	0.72	1.05
Earnings (loss) per common share — Diluted
Continuing operations (in dollars per share)	0.71	1.05
Discontinued operations (in dollars per share)	0.00	(0.01)
Net earnings (in dollars per share)	0.71	1.04
Cash dividends declared per common share (in dollars per share)	$ 0.44	$ 0.41