Note 11 - Business Segments - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating income	$ 163,615	$ 175,792	$ 313,004	$ 343,682
JBI [Member] | Operating Segments [Member]
Operating income	109,700	105,600	205,000	208,800
DCS [Member] | Operating Segments [Member]
Operating income	48,600	50,500	93,300	95,200
ICS [Member] | Operating Segments [Member]
Operating income	(200)	10,900	4,200	21,700
JBT [Member] | Operating Segments [Member]
Operating income	5,500	8,800	10,500	18,000
Corporate and Other [Member] | Operating Segments [Member]
Operating income