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Note 14 - Segment Information - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating income	$ 207,691	$ 175,503	$ 175,183	$ 154,741	$ 205,074	$ 167,862	$ 193,093	$ 167,795	$ 713,119	$ 733,825	$ 681,021
JBI [Member] | Operating Segments [Member]
Operating income									428,000	447,000	401,000
DCS [Member] | Operating Segments [Member]
Operating income									314,000	278,000	195,000
ICS [Member] | Operating Segments [Member]
Operating income									(45,000)	(11,000)	50,000
FMS [Member] | Operating Segments [Member]
Operating income									(1,000)	(9,000)	(2,000)
JBT [Member] | Operating Segments [Member]
Operating income									$ 17,000	$ 29,000	$ 37,000

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

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