Note 13 - Business Segments - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating income	$ 167,862	$ 174,688	$ 528,750	$ 558,282
JBI [Member] \| Operating Segments [Member]
Operating income	88,700	120,300	316,400	368,600
DCS [Member] \| Operating Segments [Member]
Operating income	78,300	35,000	189,000	134,000
ICS [Member] \| Operating Segments [Member]
Operating income	(5,600)	10,200	800	34,000
JBT [Member] \| Operating Segments [Member]
Operating income	6,600	9,200	22,700	21,800
Corporate and Reconciling Items [Member]
Operating income	$ (100)	$ 0	$ (100)	$ (100)