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SUBSEQUENT EVENTS (Details) - Secured Debt - USD ($) $ in Thousands				3 Months Ended
	Apr. 15, 2019	Feb. 28, 2019	Oct. 16, 2018	Mar. 31, 2019	Apr. 14, 2019	Dec. 31, 2018	May 31, 2018
$495 Million Credit Facility
Subsequent Events
Maximum borrowing capacity		$ 495,000		$ 495,000		$ 495,000
Collateral vessel replacement period				180 days
$495 Million Credit Facility | Genco Cavalier
Subsequent Events
Maximum borrowing capacity			$ 495,000
Collateral vessel replacement period			180 days
$460 Million Credit Facility
Subsequent Events
Maximum borrowing capacity							$ 460,000
$35,000 Scrubber Tranche
Subsequent Events
Maximum borrowing capacity		35,000		$ 35,000
Period upon final maturity on May 31, 2023 | $460 Million Credit Facility
Subsequent Events
Final payment amount							$ 190,000
Period After March 31, 2020 | $35,000 Scrubber Tranche
Subsequent Events
Amount of periodic payment		$ 2,500
Subsequent Event | $495 Million Credit Facility
Subsequent Events
Vessel sale proceeds utilized as a loan repayment	$ 4,947
Maximum borrowing capacity	495,000
Subsequent Event | $460 Million Credit Facility
Subsequent Events
Maximum borrowing capacity	460,000
Subsequent Event | $35,000 Scrubber Tranche
Subsequent Events
Maximum borrowing capacity	34,628				$ 35,000
Subsequent Event | Period June 30, 2019 and thereafter | $460 Million Credit Facility
Subsequent Events
Amount of periodic payment	14,864
Subsequent Event | Period upon final maturity on May 31, 2023 | $460 Million Credit Facility
Subsequent Events
Final payment amount	187,601
Subsequent Event | Period After March 31, 2020 | $35,000 Scrubber Tranche
Subsequent Events
Amount of periodic payment	$ 2,473

X

- Definition

The debt covenant period for replacement of new vessel having an equal or greater appraised value if in compliance with collateral maintenance test.

+ References

No definition available.

+ Details

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X

- Definition

Represents the required payment amount under the line of credit facility due on final maturity date.

+ References

No definition available.

+ Details

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X

- Definition

Amount of vessel sale proceeds utilized as a loan repayment due to replacement vessel was not added as collateral with period stipulated under credit facility.

+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of the required periodic payments of both interest and principal.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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