Note 12 - Business Segments - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating income	$ 164,972	$ 182,977	$ 477,976	$ 526,659
JBI [Member] | Operating Segments [Member]
Operating income	109,100	116,900	314,100	325,600
DCS [Member] | Operating Segments [Member]
Operating income	42,900	52,500	136,200	147,700
ICS [Member] | Operating Segments [Member]
Operating income	7,300	8,500	11,500	30,200
JBT [Member] | Operating Segments [Member]
Operating income	5,700	5,100	16,200	23,100
Corporate and Other [Member] | Operating Segments [Member]
Operating income				$ 100