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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Voyage expense recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Voyage expense recognition
Net (loss) gain on purchase and sale of bunker fuel and net realizable value adjustments	$ (269)	$ 2,421	$ (641)	$ 4,425

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- Definition

Represents the net gains (losses) resulting from the difference between the cost of bunker fuel delivered by the terminating charterer and the bunker fuel sold to the new charterer and the lower of cost and net realizable value adjustment to re-value bunker fuel on a quarterly basis.

+ References

No definition available.

+ Details

Name:	gnk_NetGainLossOnPurchaseAndSaleOfBunkerFuelAndLowerCostAndNetRealizableValueAdjustments
Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	gnk_VoyageExpenseRecognitionAbstract
Namespace Prefix:	gnk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration