Note 10 - Business Segments - Depreciation and Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Depreciation and amortization	$ 107,423	$ 93,050	$ 213,006	$ 185,238
Corporate and Reconciling Items [Member]
Depreciation and amortization	5,500	4,900	10,900	9,700
JBI [Member] | Operating Segments [Member]
Depreciation and amortization	42,400	40,400	85,000	80,800
DCS [Member] | Operating Segments [Member]
Depreciation and amortization	49,200	37,200	96,100	73,600
ICS [Member] | Operating Segments [Member]
Depreciation and amortization	300	300	800	600
JBT [Member] | Operating Segments [Member]
Depreciation and amortization	$ 10,000	$ 10,300	$ 20,200	$ 20,500