VESSELS UNDER CONSTRUCTION (Details) $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 03, 2015 item	May 07, 2015 item	Mar. 31, 2014 item	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) item	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) item
Vessels under construction
Interest Costs Capitalized				$ 845	$ 7,763	$ 2,251	$ 17,610
Total, beginning						177,133
Total, end				61,053		61,053		$ 177,133
Borrowings under credit facilities						$ 100,131	$ 421,695
Korean Export Credit Facility
Vessels under construction
Number of tankers in new building contract | item						1
VLCCs | Korean Export Credit Facility
Vessels under construction
Number of tankers in new building contract | item	15
Acquired VLCC Newbuildings
Vessels under construction
Capitalized interest expense, beginning						$ 71,731
Interest Costs Capitalized						2,251
Capitalized interest expense, end				73,982		73,982		71,731
Vessel delivery, beginning						(1,951,784)
Vessels delivery increase						(210,080)
Vessel delivery, end				(2,161,864)		(2,161,864)		(1,951,784)
Total, beginning						177,133
Total vessels under construction decrease						(116,080)
Total, end				61,053		61,053		177,133
2014 Acquired VLCC Newbuildings
Vessels under construction
Vessels/SPV Stock Purchase, beginning						162,683
Vessels/SPV Stock Purchase, end				162,683		162,683		162,683
Installment and supervision payments, beginning						579,818
Installment and supervision payments, end				579,818		579,818		579,818
Others, beginning						5,214
Others, end				5,214		5,214		$ 5,214
Number of vessels delivered | item								11
2014 Acquired VLCC Newbuildings | Scorpio Tankers Inc
Vessels under construction
Number of tankers in new building contract | item			7
2015 Acquired VLCC Newbuildings
Vessels under construction
Vessels/SPV Stock Purchase, beginning						435,417
Vessels/SPV Stock Purchase, end				435,417		435,417		$ 435,417
Acquisition-related costs, beginning						10,295
Acquisition-related costs, end				10,295		10,295		10,295
Installment and supervision payments, beginning						840,833
Installment and supervision payments increase						95,711
Installment and supervision payments, end				936,544		936,544		840,833
Accrued milestones and supervision payments, beginning						5,368
Accrued milestones and supervision payments decrease						(5,368)
Accrued milestones and supervision payments, end								5,368
Others, beginning						14,138
Others increase						1,406
Others, end				15,544		15,544		14,138
Fair value of 2015 Warrant Agreement assumed, beginning						3,381
Fair value of 2015 Warrant Agreement assumed, end				3,381		3,381		3,381
Fair value of stock option, beginning						39
Fair value of stock option, end				$ 39		$ 39		$ 39
Number of vessels delivered | item						2
2015 Acquired VLCC Newbuildings | Korean Export Credit Facility
Vessels under construction
Borrowings under credit facilities						$ 100,100
2015 Acquired VLCC Newbuildings | Crude Oil Tanker | Navig8 Crude Tankers Inc
Vessels under construction
Number of tankers in new building contract | item		14