CONTINGENCIES (Details)			6 Months Ended
	Jul. 16, 2019 USD ($)	Jul. 16, 2019 CAD ($)	Jun. 30, 2019 USD ($)	May 10, 2019 Vessel	Mar. 22, 2014 Vessel TankBarge
Guaranties [Abstract]
Issued guaranties			$ 18,795,000
Maximum [Member]
Guaranties [Abstract]
Guarantor obligations, expiration period			2 years
Performance Bonds [Member]
Guaranties [Abstract]
Issued guaranties			$ 11,734,000
Subsequent Event [Member]
Loss Contingency [Abstract]
Settlement amount to Canadian government	$ 2,200,000	$ 2,900,000
Struck by LPG Tanker, the Genesis River [Member]
Loss Contingency [Abstract]
Number of vessels involved in collision | Vessel				2
Collision with M/S Summer Wind [Member]
Loss Contingency [Abstract]
Number of vessels involved in collision | Vessel					2
Number of vessels damaged in collision resulting in fuel oil discharge | TankBarge					1
Letters of Credit [Member]
Guaranties [Abstract]
Issued guaranties			$ 7,061,000