OTHER OPERATING GAINS - Summary of Contracts (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
GAIN ON SALE OF ASSETS AND AMORTIZATION OF DEFERRED GAINS [Abstract]
Insurance recoveries	$ 3,737	$ 0	$ 0
Other gains	628	0	0
Gain on termination of vessel leases	0	10,324	2,379
Gain (loss) on pool arrangements	(943)	(118)	2
Other operating (losses) gains	$ 3,422	$ 10,206	$ 2,381

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

Name:	us-gaap_InsuranceRecoveries
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration