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REVENUE FROM TIME CHARTERS (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
REVENUE FROM TIME CHARTERS |  |
Voyage revenues | $ 63,180 | $ 39,676
Profit sharing revenue | 0 | 0
Future minimum time charter revenue |  |
Remainder of 2014 | $ 12,596 |
Offhire period | 20 days |

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- Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Definition Represents the expected future minimum charter revenue, based on vessels committed to noncancellable time charter contracts for the remainder of the fiscal year following the latest fiscal year ended. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the assumed offhire days for a vessel which has a scheduled drydocking. + References No definition available. + Details
Name: | gnk_TimeCharterOffhirePeriod
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Balance Type: | na
Period Type: | duration

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- Definition Represents the profit sharing revenue included in time charter revenues. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Revenue from transporting cargo and freight between locations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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