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Intangible Assets/Liabilities - Charter Agreements (Details)	12 Months Ended
	Dec. 31, 2018 Vessel
Poseidon Transaction [Member]
FiniteLivedIntangibleAssetsAndLiabilitiesLineItems [Line Items]
Number of vessels related to intangible assets	2
At Merger [Member]
FiniteLivedIntangibleAssetsAndLiabilitiesLineItems [Line Items]
Number of vessels related to intangible liabilities	5
Number of vessels related to intangible assets	2

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- Definition

Number of vessels contracted with finite lived intangible assets.

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Number of vessels contracted with finite lived intangible liability.

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