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Transactions with related parties - Dynagas Ltd. (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2013
Related Party Transaction |  |  |  |
Automatic extension of Management Agreements increments | 8 years |  |  |
Management services agreement initial termination date | December 31, 2020 |  |  |
Daily management fee | $ 2,800 | $ 2,700 | $ 2,700 | $ 2,500
Management fees annual upward percentage adjustment | 3.00% |  |  |
Charter Hire Commission payable to the Management company | 1.25% |  |  |
Lump sum payable to the management company for the supervision of vessels construction | $ 700,000 |  |  |
Cancellation of management agreement termination fee | 19,100,000 |  |  |
Management fee paid in advance | $ 1,350,000 | $ 1,350,000 |  |
Management agreement terms | The Management Agreements will terminate automatically after a change of control of the owners and/or of the owners’ ultimate parent, in which case an amount equal to the estimated remaining fees, but in any case not less than for a period of 36 months and not more than 60 months, will become payable to the Manager. |  |  |
Minimum |  |  |  |
Related Party Transaction |  |  |  |
Period for calculation of management agreement termination fee | 36 months |  |  |
Maximum |  |  |  |
Related Party Transaction |  |  |  |
Period for calculation of management agreement termination fee | 60 months |  |  |

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- Definition The additional period increments by which the Management Agreements are automatically extended, if notice of termination is not previously provided. + References No definition available. + Details
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- Definition The amount of payment as penalty under the management agreements for the termination of contract after a change of control of the owners and / or the owners' ultimate parent. + References No definition available. + Details
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- Definition Daily management fee payable to the management company. + References No definition available. + Details
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- Definition Lump sum payable to the management company for newbuilding supervision services. + References No definition available. + Details
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- Definition Aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle). + 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 210.5-02.11) -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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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