Consolidated Condensed Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Lease and rental revenues	$ 824,253	$ 767,590
Services revenue	928,144	840,687
Fuel services revenue	151,070	128,706
Total revenues	1,903,467	1,736,983
Cost of lease and rental	619,207	578,762
Cost of services	787,238	702,900
Cost of fuel services	146,903	125,850
Other operating expenses	33,470	31,271
Selling, general and administrative expenses	208,624	201,095
Non-operating pension costs	1,222	7,330
Used vehicle sales, net	7,409	(780)
Interest expense	37,781	34,886
Miscellaneous income, net	(2,510)	(4,953)
Restructuring and other, net	16,023	0
Total expenses	1,855,367	1,676,361
Earnings from continuing operations before income taxes	48,100	60,622
Provision for income taxes	14,168	22,086
Earnings from continuing operations	33,932	38,536
Loss from discontinued operations, net of tax	(427)	(130)
Net earnings	$ 33,505	$ 38,406
Earnings (loss) per common share — Basic
Continuing operations (in dollars per share)	$ 0.65	$ 0.73
Discontinued operations (in dollars per share)	(0.01)	0.00
Net earnings (in dollars per share)	0.64	0.72
Earnings (loss) per common share — Diluted
Continuing operations (in dollars per share)	0.64	0.72
Discontinued operations (in dollars per share)	(0.01)	0.00
Net earnings (in dollars per share)	0.63	0.72
Cash dividends declared per common share (in dollars per share)	$ 0.52	$ 0.44