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Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Feb. 28, 2019	Dec. 31, 2018	Sep. 30, 2018	Aug. 14, 2018	Mar. 31, 2018	Nov. 10, 2016	Nov. 04, 2015
Secured Debt | $108 Million Credit Facility
Maximum borrowing capacity	$ 108,000		$ 108,000	$ 108,000	$ 108,000
Secured Debt | $495 Million Credit Facility
Maximum borrowing capacity	$ 495,000	$ 495,000	$ 495,000
Secured Debt | $400 Million Credit Facility
Maximum borrowing capacity						$ 400,000	$ 400,000
Line of Credit Facility | $98 Million Credit Facility
Maximum borrowing capacity						$ 98,000		$ 98,000

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_DebtInstrumentAxis=gnk_AmendedNordeaBankSeniorSecuredCreditFacilityMember
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- Details

Name:	us-gaap_DebtInstrumentAxis=gnk_NordeaBankSeniorSecuredTermLoanFacilityMember
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- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
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- Details

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