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VOYAGE REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Revenue from Time Charters
Retained deficit	$ 968,830				$ 743,257				$ 968,830	$ 743,257
Income statement
Lease revenue									78,402	108,096	$ 168,392
Spot market voyage revenue									277,158	281,400	199,130
Revenues									355,560	389,496	367,522
Voyage
Income statement
Revenues	$ 95,495	$ 87,524	$ 74,206	$ 98,336	$ 108,705	$ 103,776	$ 83,550	$ 93,464	$ 355,560	$ 389,496	$ 367,522
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue from Time Charters
Retained deficit												$ 659

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Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor.

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