Note 13 - Business Segments - Depreciation and Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Depreciation and amortization	$ 123,995	$ 107,423	$ 243,924	$ 213,006
Corporate and Reconciling Items [Member]
Depreciation and amortization	8,400	5,500	16,900	10,900
JBI [Member] | Operating Segments [Member]
Depreciation and amortization	44,800	42,400	89,100	85,000
DCS [Member] | Operating Segments [Member]
Depreciation and amortization	61,500	49,200	118,900	96,100
ICS [Member] | Operating Segments [Member]
Depreciation and amortization	900	300	1,800	800
JBT [Member] | Operating Segments [Member]
Depreciation and amortization	$ 8,400	$ 10,000	$ 17,200	$ 20,200