REVENUES (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 666,809,000	$ 704,845,000	$ 2,182,472,000	$ 2,249,204,000
Revenue recognized			75,105,000
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	412,665,000	382,040,000	1,185,072,000	1,100,606,000
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	316,000,000	288,573,000	909,247,000	827,848,000
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	96,665,000	93,467,000	275,825,000	272,758,000
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	254,144,000	322,805,000	997,400,000	1,148,598,000
Distribution and Services [Member] | Oil and Gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	118,096,000	201,475,000	540,061,000	780,825,000
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 136,048,000	$ 121,330,000	$ 457,339,000	$ 367,773,000