REVENUES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 744,621	$ 741,688
Revenue recognized	50,921
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	368,121	340,403
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	283,085	252,355
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	85,036	88,048
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	376,500	401,285
Distribution and Services [Member] | Oil and Gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	223,101	274,491
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 153,399	$ 126,794