GOODWILL (Details) $ in Thousands		1 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($)	Jul. 31, 2014 item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Goodwill Gross
Balance at the beginning of the year			$ 117,416	$ 118,256
Transfer to assets held for sale				(840)
Write-off related to sale of vessels			(2,994)		$ (1,249)
Balance at the end of the year			114,422	117,416	118,256
Goodwill, Impaired, Accumulated Impairment Loss
Balance at the beginning of the year			(91,125)	(91,125)
Impairment loss	$ (23,300)		(23,297)		(2,100)
Balance at the end of the year			(114,422)	(91,125)	(91,125)
Goodwill Net
Balance at the beginning			26,291	27,131
Transfer to assets held for sale				(840)
Write-off related to sale of vessels			(2,994)		(1,249)
Impairment loss	$ (23,300)		(23,297)		(2,100)
Balance at the end			0	26,291	27,131
MR tanker Gener8 Consul
Goodwill Gross
Transfer to assets held for sale				(800)
Goodwill Net
Transfer to assets held for sale				$ (800)
Suezmax
Goodwill Gross
Write-off related to sale of vessels					(1,200)
Goodwill Net
Write-off related to sale of vessels					$ (1,200)
Number of vessels sold | item		1
Genmar Victory and Genmar Vision
Goodwill Gross
Write-off related to sale of vessels			(3,000)
Goodwill Net
Write-off related to sale of vessels			$ (3,000)