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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Charter Hire Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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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