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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Charter Hire Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Charter hire expenses	$ 9,069	$ 9,135	$ 27,130

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- Definition

Represents the costs incurred for third-party vessels that are time chartered-in.

+ References

No definition available.

+ Details

Name:	gnk_CharterHireExpense
Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration