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ACQUISITIONS (Details) $ in Thousands			3 Months Ended
	Mar. 29, 2019 USD ($) TankBarge	Mar. 14, 2019 USD ($) bbl Tugboat TankBarge Towboat	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Acquisitions [Abstract]
Purchase price			$ 60,932	$ 40,961
Inland Tank Barges [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | TankBarge	3
Purchase price	$ 2,970
Cenac Marine Services, LLC [Member]
Assets [Abstract]
Prepaid expenses		$ 1,138
Property and equipment		246,802
Other intangibles		260
Total assets		248,200
Other long-term liabilities		3,700
Net assets acquired		$ 244,500
Weighted average amortization period of intangibles			2 years
Weighted average amortization period of unfavorable contracts			1 year 2 months 12 days
Acquisition related costs			$ 247
Cenac Marine Services, LLC [Member] | Inland Tank Barges [Member]
Acquisitions [Abstract]
Average age of property			5 years
Cenac Marine Services, LLC [Member] | Inland Barrel Tank Barges [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | TankBarge		63
Tank barge barrel capacity (in barrels) | bbl		30,000
Aggregate tank barge barrel capacity (in barrels) | bbl		1,833,000
Cenac Marine Services, LLC [Member] | Inland Towboats [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | Towboat		34
Average age of property			7 years
Cenac Marine Services, LLC [Member] | Offshore Tugboats [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | Tugboat		2

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