Note 10 - Business Segments - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
JBI [Member] | Operating Segments [Member]
Operating income	$ 116,900	$ 126,100	$ 325,600	$ 349,000
DCS [Member] | Operating Segments [Member]
Operating income	52,500	45,100	147,700	121,500
ICS [Member] | Operating Segments [Member]
Operating income	8,500	11,500	30,200	23,000
JBT [Member] | Operating Segments [Member]
Operating income	5,100	11,200	23,100	29,400
Corporate and Other [Member] | Operating Segments [Member]
Operating income		(100)	100	(100)
Operating income	$ 182,977	$ 193,846	$ 526,659	$ 522,801