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SUBSEQUENT EVENTS (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Jan. 07, 2015 | Dec. 31, 2014 | Dec. 30, 2014 | Jan. 02, 2015 | Feb. 27, 2015 | Oct. 08, 2014
Subsequent Event |  |  |  |  |  |  |
Remaining payment to acquire vessel | $ 24,473 gnk_PaymentsToAcquireVesselsAndOtherDeposits |  |  |  |  |  |
Baltic Trading 2014 Term Loan Facilities | Baltic Wasp |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 16,800 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember / gnk_VesselsByNameAxis = gnk_BalticWaspMember
Baltic Trading $148 Million Credit Facility |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Drawdowns during the period |  | 104,500 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember | 0 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |
Maximum borrowing capacity | 148,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  | 148,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |
Baltic Trading $115 Million Revolving Credit Facility |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Maximum borrowing capacity | 115,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2014Member |  | 115,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2014Member |  |  |  |
Baltic Trading Limited | Baltic Trading 2014 Term Loan Facilities | Baltic Wasp |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Drawdowns during the period |  |  |  | 16,350 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / gnk_VesselsByNameAxis = gnk_BalticWaspMember |  |  |
Subsequent Event | Baltic Trading Limited | Baltic Wasp |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Capacity of Vessels in Deadweight Tonnage |  |  |  |  | 63,389 gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / gnk_VesselsByNameAxis = gnk_BalticWaspMember |  |
Remaining payment to acquire vessel |  |  |  |  | 19,400 gnk_PaymentsToAcquireVesselsAndOtherDeposits / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / gnk_VesselsByNameAxis = gnk_BalticWaspMember |  |
Subsequent Event | Baltic Trading Limited | Baltic Trading $148 Million Credit Facility |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  | $ 10,500 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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