Note 10 - Business Segments - Depreciation and Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Depreciation and amortization	$ 132,392	$ 126,803	$ 392,786	$ 370,728
Segment Reconciling Items [Member]
Depreciation and amortization	11,800	8,800	33,200	25,700
JBI [Member] | Operating Segments [Member]
Depreciation and amortization	47,400	45,800	140,700	134,900
DCS [Member] | Operating Segments [Member]
Depreciation and amortization	55,900	54,900	167,800	159,400
ICS [Member] | Operating Segments [Member]
Depreciation and amortization	300	900	900	2,700
FMS [Member] | Operating Segments [Member]
Depreciation and amortization	8,200	8,200	24,600	22,600
JBT [Member] | Operating Segments [Member]
Depreciation and amortization	$ 8,800	$ 8,200	$ 25,600	$ 25,400