Note 10 - Business Segments - Depreciation and Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Depreciation and amortization	$ 137,545	$ 130,095
Segment Reconciling Items [Member]
Depreciation and amortization	13,400	10,600
JBI [Member] | Operating Segments [Member]
Depreciation and amortization	49,100	46,500
DCS [Member] | Operating Segments [Member]
Depreciation and amortization	56,900	56,300
ICS [Member] | Operating Segments [Member]
Depreciation and amortization	200	400
FMS [Member] | Operating Segments [Member]
Depreciation and amortization	9,000	8,100
JBT [Member] | Operating Segments [Member]
Depreciation and amortization	$ 8,900	$ 8,200