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VESSEL ACQUISITIONS (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 0 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Nov. 13, 2013 item
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |
Deposits on vessels | $ 19,237 us-gaap_DepositsAssets |  |  | $ 25,593 us-gaap_DepositsAssets |
Baltic Trading Limited |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |
Capitalized interest associated with new building contracts | 124 us-gaap_InterestCostsCapitalized / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember |  |  |  |
Baltic Trading Limited | Baltic Wasp |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |
Final payment for vessel |  | 19,645 gnk_PaymentsHeldInEscrowAccount / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / gnk_VesselsByNameAxis = gnk_BalticWaspMember |  |  |
Predecessor |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |
Amortization of time charters acquired |  |  | 49 us-gaap_RecognitionOfDeferredRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Predecessor | Baltic Trading Limited |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |
Capitalized interest associated with new building contracts |  |  | 98 us-gaap_InterestCostsCapitalized / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Predecessor | Yangfan Group Co., LTD | Agreement to Purchase Ultramax Drybulk Vessels | Baltic Trading Limited |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |
Number of vessels purchased |  |  |  |  | 2 gnk_NumberOfVesselsToBeAcquiredUnderPurchaseAgreement / gnk_AgreementAxis = gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_YangfanGroupCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Total purchase price per vessel |  |  |  |  | 28,000 gnk_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceedsPerVessel / gnk_AgreementAxis = gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_YangfanGroupCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Capacity of vessels |  |  |  |  | 64,000 gnk_CapacityOfVesselsInDeadweightTonnage / gnk_AgreementAxis = gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_YangfanGroupCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor | Yangfan Group Co., LTD | Agreement to Purchase Ultramax Drybulk Vessels | Baltic Trading Limited | Maximum |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |
Aggregate purchase price |  |  |  |  | 112,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / gnk_AgreementAxis = gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_YangfanGroupCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Number of vessels purchased under option to be acquired per purchase agreement |  |  |  |  | 2 gnk_NumberOfVesselsPurchasedUnderOptionToBeAcquiredPerPurchaseAgreement / gnk_AgreementAxis = gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_YangfanGroupCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Number of vessels committed to be acquired under purchase agreement |  |  |  |  | 4 gnk_NumberOfVesselsCommittedToBeAcquiredUnderPurchaseAgreement / gnk_AgreementAxis = gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_YangfanGroupCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Baltic Trading $148 Million Credit Facility |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |
Face amount of term loan facility | $ 148,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  | $ 148,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |
Baltic Trading $148 Million Credit Facility | Forecast |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |
Number of vessels purchased by using term loan finance | 2 gnk_NumberOfAssetsAcquiredByFinancingThroughTermLoans / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |  |  |  |

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