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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Voyage Expense Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Voyage expense recognition
Net (loss) gain on purchase and sale of bunker fuel and net realizable value adjustments	$ (697)	$ (829)	$ 3,000

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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.

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No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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