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Vessels, net: | 12 Months Ended
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Dec. 31, 2017
Vessels, Net [Abstract] |
Vessels, net: | 4. Vessels, net: The amounts in the accompanying consolidated balance sheets are analyzed as follows:
|  | Vessel Cost |  |  | Accumulated Depreciation |  |  |  | Net Book Value
Balance December 31, 2015 |  | $ | 1,165,645 |  |  | $ | (129,488) |  |  | $ | 1,036,157
—Other additions to vessels’ cost |  |  | 1,855 |  |  |  | — |  |  |  | 1,855
—Depreciation |  |  | — |  |  |  | (30,395) |  |  |  | (30,395)
Balance December 31, 2016 |  | $ | 1,167,500 |  |  | $ | (159,883) |  |  | $ | 1,007,617
—Depreciation |  |  | — |  |  |  | (30,319) |  |  |  | (30,319)
Balance December 31, 2017 |  | $ | 1,167,500 |  |  | $ | (190,202) |  |  | $ | 977,298

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- References No definition available. + Details
Name: | dlng_VesselsNetAbstract
Namespace Prefix: | dlng_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Disclosure of vessels that are used in the normal conduct of business to produce goods and services and not intended for resale. + References No definition available. + Details
Name: | dlng_VesselsNetTextBlock
Namespace Prefix: | dlng_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration