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DEBT (Details 2) $ in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2015 USD ($) | Jul. 09, 2015 USD ($) | Apr. 30, 2015 USD ($) item | Apr. 24, 2015 item | Dec. 31, 2014 USD ($) | Jul. 09, 2014 USD ($) | Sep. 04, 2013 USD ($) | Sep. 04, 2013 | Aug. 30, 2013 USD ($) item | Oct. 31, 2015 USD ($) | Aug. 31, 2015 item | Jul. 31, 2015 item | Apr. 30, 2015 USD ($) | Feb. 28, 2015 USD ($) | Jun. 30, 2015 USD ($) | Aug. 03, 2015 | Jul. 14, 2015 USD ($) | Jun. 30, 2014 USD ($) | Aug. 20, 2010 USD ($) item | Aug. 12, 2010 USD ($) item
Amended and Restated Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in the minimum consolidated net worth ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,730 |  |  |
Condensed net worth to be maintained |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 270,150 |  |  |
Secured Debt | $100 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |
Payment of upfront fees |  |  | $ 165 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remedy period available to post additional collateral or reduce the amount of the revolving loans and/or letters of credit outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |
Long-term Debt |  |  |  |  | 67,792 |  |  |  |  |  |  |  |  |  | 63,946 |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |  |  |
Maintained Aggregate fair market value of the mortgaged vessels as a percentage of aggregate outstanding principal amount (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 122.40% |  |  |  |  |  |
Shortfall |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,150 |  |  |  |  |  |
Number of unencumbered vessels adding as additional collateral to cover the shortfall of fair value | item |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | $100 Million and $253 Million Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum cash required to be maintained by each collateralized vessel |  |  | $ 750 |  |  |  |  |  |  |  |  |  | $ 750 |  |  |  |  |  |  |
Minimum total debt outstanding to value adjusted total assets ratio |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of liquidity covenant amended |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum period of available working capital lines |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |
Secured Debt | $100 Million and $253 Million Term Loan Facilities | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |
Reference rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |
Secured Debt | $253 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 253,000 |  |  |  |  |  |  |  |  |  | $ 253,000 |  |  |  |  |
Payment of upfront fees |  |  | $ 350 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remedy period available to post additional collateral or reduce the amount of the revolving loans and/or letters of credit outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |
Long-term Debt |  |  |  |  | 165,568 |  |  |  |  |  |  |  |  |  | $ 155,418 |  |  |  |  |
Restricted cash |  |  |  |  | 9,750 |  |  |  |  |  |  |  |  |  | 9,750 |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Amount of periodic payment |  | $ 5,075 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135.00% |  |  |  |  |
Maintained Aggregate fair market value of the mortgaged vessels as a percentage of aggregate outstanding principal amount (as a percent) |  | 133.50% |  |  |  |  |  |  |  |  |  |  |  |  | 129.20% |  |  |  |  |
Prepayment of the outstanding indebtedness | $ 1,650 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels secured as collateral | item |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of unencumbered vessels adding as additional collateral to cover the shortfall of fair value | item |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |
Secured Debt | Baltic Trading 2014 Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  | 33,150 |  |  |  |  |  |  |  |  |  | $ 32,450 |  |  |  |  |
Secured Debt | Baltic Trading $22 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 22,000 |  |  |  |  |  |  |  |  |  | 22,000 |  |  |  |  |
Long-term Debt |  |  |  |  | 20,125 |  |  |  |  |  |  |  |  |  | 19,375 |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Secured Debt | Baltic Trading $33 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 33,000 |  |  |  |  |  |  |  |  |  | 33,000 |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,000 |  |  |  |  |
Secured Debt | Baltic Trading $33 Million Term Loan Facility | Baltic Scorpion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 140.00% |  |  |  |
Line of Credit facility | Baltic Trading $148 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 148,000 |  |  |  |  |  |  |  |  |  | $ 148,000 |  |  |  |  |
Minimum cash balance required per vessel owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750 |  |  |
Commitment fee on unused daily average unutilized commitment (as a percent) |  |  |  |  | 1.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remedy period available to post additional collateral or reduce the amount of the revolving loans and/or letters of credit outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 days |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 115,000 |  |  |  |  |
Long-term Debt |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  | $ 112,553 |  |  |  |  |
Period after latest vessel delivery date for first periodic repayment |  |  |  |  | 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 140.00% |  |  |  |  |
Maintained Aggregate fair market value of the mortgaged vessels as a percentage of aggregate outstanding principal amount (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 132.00% |  |  |  |  |
Number of unencumbered vessels adding as additional collateral to cover the shortfall of fair value | item |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Line of Credit facility | Baltic Trading $148 Million Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Predecessor | Secured Debt | $100 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  | $ 100,000
Paydown of debt |  |  |  |  |  | $ 1,923 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels acquired | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5
Predecessor | Secured Debt | $100 Million and $253 Million Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum cash balance required per vessel owned |  |  |  |  |  | $ 750 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Predecessor | Secured Debt | $100 Million and $253 Million Term Loan Facilities | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate for interest payable, before increase (as a percent) |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Predecessor | Secured Debt | $253 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 253,000 | $ 253,000 |
Paydown of debt |  |  |  |  |  | $ 5,075 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels acquired | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |
Predecessor | Secured Debt | Baltic Trading $22 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 22,000 |  |  |  |  |  |  |  |  | $ 22,000 |  |
Final payment amount |  |  |  |  |  |  |  |  | $ 13,375 |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused daily average unutilized commitment (as a percent) |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Number of quarterly installments | item |  |  |  |  |  |  |  |  | 23 |  |  |  |  |  |  |  |  |  |  |
Amount of periodic payment |  |  |  |  |  |  |  |  | $ 375 |  |  |  |  |  |  |  |  |  |  |
Period after latest vessel delivery date for first periodic repayment |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |  |  |  |  |  |
Term of facilities |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |  |  |  |  |
Predecessor | Secured Debt | Baltic Trading $22 Million Term Loan Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate |  |  |  |  |  |  |  |  | 3.35% |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  |  |  |  | three-month LIBOR |  |  |  |  |  |  |  |  |  |  |
Predecessor | Secured Debt | Baltic Trading $22 Million Term Loan Facility | Baltic Hare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  | $ 10,730 |  |  |  |  |  |  |  |  |  |  |  |  |
Predecessor | Secured Debt | Baltic Trading $22 Million Term Loan Facility | Baltic Fox |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  | $ 11,270 |  |  |  |  |  |  |  |  |  |  |  |  |
Period from June 30, 2015 to December 30, 2015 | Secured Debt | Baltic Trading 2014 Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125.00% |  |  |
Period from December 31, 2015 to March 30, 2016 | Secured Debt | Baltic Trading 2014 Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |
Period from March 31, 2016 and thereafter | Secured Debt | Baltic Trading 2014 Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135.00% |  |  |
Up to June 30, 2016 | Secured Debt | Baltic Trading $22 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110.00% |  |  |
Up to December 31, 2015 | Line of Credit facility | Baltic Trading $148 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |
After December 31, 2015 | Line of Credit facility | Baltic Trading $148 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 140.00% |  |  |
Forecast | Secured Debt | $253 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of periodic payment |  |  |  |  |  |  |  |  |  | $ 5,075 |  |  |  |  |  |  |  |  |  |

X
- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument before amendment. + References No definition available. + Details
Name: | gnk_DebtInstrumentBasisSpreadOnVariableRateBeforeAmendment
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the minimum cash required per vessel mortgaged under this facility. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityCovenantCashAndCashEquivalentAndRemainingBorrowingCapacityForWorkingCapitalPerVesselRequiredToBeMaintained
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the aggregate fair value of the mortgaged vessels to be maintained as a percentage of aggregate outstanding principal amount as per the terms of the credit facilities' covenants. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsAsPercentageOfAggregateOutstandingPrincipalAmount
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the aggregate fair value of the mortgaged vessels actual as a percentage of aggregate outstanding principal amount as per the terms of the credit facilities' covenants. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsAsPercentageOfAggregateOutstandingPrincipalAmountActual
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of short fall in fair value of mortgaged assets. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsShortfallOnAggregateOutstandingPrincipalAmount
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the minimum cash balance per vessel required to be maintained for vessels owned under the credit facility. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityMinimumCashBalanceRequiredPerVesselOwned
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the number of quarterly installments in which the line of credit facility shall be repaid. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityNumberOfQuarterlyInstallments
Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the required payment amount under the line of credit facility due on final maturity date. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityPaymentAmountDueAtMaturity
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of upfront fee paid under the terms of credit facilities. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityPaymentOfUpfrontFee
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the period after latest vessel delivery date for first periodic repayment of the line of credit facility. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityPeriodAfterLatestVesselDeliveryDateForFirstPeriodicRepayment
Namespace Prefix: | gnk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amended maximum percentage of fleetwide liquidity covenant required. + References No definition available. + Details
Name: | gnk_MaximumPercentageOfLiquidityCovenantAmended
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of minimum condensed net worth to be maintained. + References No definition available. + Details
Name: | gnk_MinimumCondensedNetWorthToBeMaintained
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the minimum period of working capital lines with remaining availability, in which the covenant of 50% of the required covenant of cash per vessel is satisfied. + References No definition available. + Details
Name: | gnk_MinimumPeriodOfWorkingCapitalLinesWithRemainingAvailability
Namespace Prefix: | gnk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the ratio of total debt outstanding to value adjusted total assets (total assets adjustment for the difference between book value and market value of fleet vessels). + References No definition available. + Details
Name: | gnk_MinimumTotalDebtToAdjustedTotalAssetsRatio
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