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VOYAGE REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Revenue from Time Charters
Retained deficit	$ 743,257				$ 687,272				$ 743,257	$ 687,272
Income statement
Lease revenue									108,096	168,392	$ 181,249
Spot market voyage revenue									281,400	199,130	28,449
Revenues									389,496	367,522	209,698
Voyage
Income statement
Revenues	$ 108,705	$ 103,776	$ 83,550	$ 93,464	$ 112,185	$ 92,263	$ 86,157	$ 76,916	389,496	367,522	209,698
Profit Sharing
Income statement
Revenues									$ 0	$ 0	$ 2,325
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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