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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended | 1 Months Ended | 6 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Sep. 30, 2005 | Jul. 09, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2011
Commitments and contingencies |  |  |  |  |  |  |
Long-term lease obligations | $ 390 us-gaap_DeferredRentCreditNoncurrent | $ 390 us-gaap_DeferredRentCreditNoncurrent |  |  |  |  |
Lease agreement entered into April 2011 |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |
Rent expense | 865 us-gaap_LeaseAndRentalExpense / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member |  |  |  |  |  |
Long-term lease obligations | 390 us-gaap_DeferredRentCreditNoncurrent / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member | 390 us-gaap_DeferredRentCreditNoncurrent / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member |  |  |  |  |
Future minimum rental payments |  |  |  |  |  |  |
2015 | 1,037 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member | 1,037 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member |  |  |  |  |
2016 | 1,076 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member | 1,076 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member |  |  |  |  |
2017 | 1,076 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member | 1,076 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member |  |  |  |  |
2018 | 916 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member | 916 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member |  |  |  |  |
2019 | 2,230 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member | 2,230 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member |  |  |  |  |
Remaining term of the lease | 13,360 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member | 13,360 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member |  |  |  |  |
Obligation of sublessor towards the cost of alterations of office space |  | 472 gnk_OperatingLeasesObligationOfSublessorTowardsCostOfAlterationsOfAssetUnderLease / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member |  |  |  |  |
Lease agreement entered into April 2011 | Period during July 9, 2014 to September 30, 2025 |  |  |  |  |  |  |
Future minimum rental payments |  |  |  |  |  |  |
Monthly straight-line rental expense | 150 gnk_OperatingLeasesMonthlyRentExpense / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member / gnk_OperatingLeaseRentExpensePeriodAxis = gnk_PeriodDuringJuly92014ToSeptember302025Member | 150 gnk_OperatingLeasesMonthlyRentExpense / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member / gnk_OperatingLeaseRentExpensePeriodAxis = gnk_PeriodDuringJuly92014ToSeptember302025Member |  |  |  |  |
Sub Sublease Agreement | Period until May 31, 2015 |  |  |  |  |  |  |
Future minimum rental payments |  |  |  |  |  |  |
Monthly rental payment | 82 gnk_OperatingLeasesMonthlyRentPayment / gnk_LeaseAgreementsTypeAxis = gnk_SubSubleaseAgreementMember / gnk_OperatingLeaseRentExpensePeriodAxis = gnk_OperatingLeaseRentExpensePeriodUntil31May2015Member | 82 gnk_OperatingLeasesMonthlyRentPayment / gnk_LeaseAgreementsTypeAxis = gnk_SubSubleaseAgreementMember / gnk_OperatingLeaseRentExpensePeriodAxis = gnk_OperatingLeaseRentExpensePeriodUntil31May2015Member |  |  |  |  |
Sub Sublease Agreement | Period after May 31, 2015 until April 30, 2018 |  |  |  |  |  |  |
Future minimum rental payments |  |  |  |  |  |  |
Monthly rental payment | 90 gnk_OperatingLeasesMonthlyRentPayment / gnk_LeaseAgreementsTypeAxis = gnk_SubSubleaseAgreementMember / gnk_OperatingLeaseRentExpensePeriodAxis = gnk_OperatingLeaseRentExpensePeriodAfter31May2015UntilEndOfLeaseTermMember | 90 gnk_OperatingLeasesMonthlyRentPayment / gnk_LeaseAgreementsTypeAxis = gnk_SubSubleaseAgreementMember / gnk_OperatingLeaseRentExpensePeriodAxis = gnk_OperatingLeaseRentExpensePeriodAfter31May2015UntilEndOfLeaseTermMember |  |  |  |  |
Direct Lease Agreement | Period from October 1, 2018 to April 30, 2023 |  |  |  |  |  |  |
Future minimum rental payments |  |  |  |  |  |  |
Monthly rental payment | 186 gnk_OperatingLeasesMonthlyRentPayment / gnk_LeaseAgreementsTypeAxis = gnk_DirectLeaseAgreementMember / gnk_OperatingLeaseRentExpensePeriodAxis = gnk_OperatingLeaseRentExpensePeriodFrom1October2018To30April2023Member | 186 gnk_OperatingLeasesMonthlyRentPayment / gnk_LeaseAgreementsTypeAxis = gnk_DirectLeaseAgreementMember / gnk_OperatingLeaseRentExpensePeriodAxis = gnk_OperatingLeaseRentExpensePeriodFrom1October2018To30April2023Member |  |  |  |  |
Direct Lease Agreement | Period from May 1, 2023 to September 30, 2025 |  |  |  |  |  |  |
Future minimum rental payments |  |  |  |  |  |  |
Monthly rental payment | 204 gnk_OperatingLeasesMonthlyRentPayment / gnk_LeaseAgreementsTypeAxis = gnk_DirectLeaseAgreementMember / gnk_OperatingLeaseRentExpensePeriodAxis = gnk_OperatingLeaseRentExpensePeriodFrom1May2023To30September2025Member | 204 gnk_OperatingLeasesMonthlyRentPayment / gnk_LeaseAgreementsTypeAxis = gnk_DirectLeaseAgreementMember / gnk_OperatingLeaseRentExpensePeriodAxis = gnk_OperatingLeaseRentExpensePeriodFrom1May2023To30September2025Member |  |  |  |  |
Predecessor |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |
Current portion of lease obligations |  |  |  |  | 176 us-gaap_DeferredRentCreditCurrent / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Long-term lease obligations |  |  |  |  | 3,114 us-gaap_DeferredRentCreditNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Predecessor | Lease agreement entered into September 2005 |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |
Lease term |  |  | 15 years |  |  |  |
Rent expense |  |  |  | (41)us-gaap_LeaseAndRentalExpense / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredSeptember2005Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 1,264 us-gaap_LeaseAndRentalExpense / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredSeptember2005Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 92 us-gaap_LeaseAndRentalExpense / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredSeptember2005Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Current portion of lease obligations |  |  |  |  | 176 us-gaap_DeferredRentCreditCurrent / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredSeptember2005Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Long-term lease obligations |  |  |  |  | 744 us-gaap_DeferredRentCreditNoncurrent / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredSeptember2005Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Predecessor | Lease agreement entered into April 2011 |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  | 7 years
Rent expense |  |  |  | 813 us-gaap_LeaseAndRentalExpense / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 1,558 us-gaap_LeaseAndRentalExpense / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 1,558 us-gaap_LeaseAndRentalExpense / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Long-term lease obligations |  |  |  |  | 2,370 us-gaap_DeferredRentCreditNoncurrent / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Predecessor | Lease agreement entered into April 2011 | Period during June 1, 2011 to September 30, 2025 |  |  |  |  |  |  |
Future minimum rental payments |  |  |  |  |  |  |
Monthly straight-line rental expense |  |  |  | $ 130 gnk_OperatingLeasesMonthlyRentExpense / gnk_LeaseAgreementsTypeAxis = gnk_LeaseAgreementForOfficeSpaceEnteredApril2011Member / gnk_OperatingLeaseRentExpensePeriodAxis = gnk_OperatingLeaseRentExpensePeriodFrom1June2011To30September2025Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |

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- Definition Represents the monthly payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease. + References No definition available. + Details
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- Definition Represents the obligation of sublessor towards the cost of alterations to the assets under the lease agreement. + References No definition available. + Details
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- Definition For a classified balance sheet, the cumulative difference as of the balance sheet date between the payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, within one year of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39927-112707 + Details
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- Definition For a classified balance sheet, the cumulative difference between the rental income or payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, more than one year after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39927-112707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.26(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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