REVENUES (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 771,042,000	$ 802,671,000	$ 1,515,663,000	$ 1,544,359,000
Revenue recognized			73,370,000
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	404,286,000	378,163,000	772,407,000	718,566,000
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	310,162,000	286,920,000	593,247,000	539,275,000
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	94,124,000	91,243,000	179,160,000	179,291,000
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	366,756,000	424,508,000	743,256,000	825,793,000
Distribution and Services [Member] | Oil and Gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	198,864,000	304,859,000	421,965,000	579,350,000
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 167,892,000	$ 119,649,000	$ 321,291,000	$ 246,443,000