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Related Party Transactions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Vessel $ / yr	Dec. 31, 2017 USD ($) $ / yr	Dec. 31, 2016 USD ($) $ / yr
Related Party Transaction [Line Items]
Due from related parties	$ 817	$ 1,932
Due to related parties	3,317	2,813
Time charter and voyage expenses - related party	$ 222	$ 0	$ 0
CMA CGM [Member]
Related Party Transaction [Line Items]
Voting interest	15.55%	44.40%	44.40%
Due from related parties	$ 817	$ 1,932
Technomar [Member]
Related Party Transaction [Line Items]
Due to related parties	1,362
Management fees	$ 722
Technomar [Member] | Poseidon Transaction [Member]
Related Party Transaction [Line Items]
Number of vessels under technical management | Vessel	19
CMA Ships [Member]
Related Party Transaction [Line Items]
Annual ship management fee per vessel | $ / yr	123	123	123
Number of vessels under technical management | Vessel	7
Due to related parties	$ 1,829	$ 2,813
Management fees	$ 967	1,599
Conchart [Member]
Related Party Transaction [Line Items]
Number of vessels under technical management | Vessel	2
Due to related parties	$ 126	$ 0
Time charter and voyage expenses - related party	$ 222
Conchart [Member] | Poseidon Transaction [Member]
Related Party Transaction [Line Items]
Number of vessels under technical management	19

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Annual ship management fees per vessel.

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Number of vessels under technical management.

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- Definition

Costs relating to the voyages performed by the vessels and may include port, canal, bunker expenses, commissions and other, incurred from transactions with related parties.

+ References

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Voting interest.

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The 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 within one year (or one business cycle).

+ References

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-Name Accounting Standards Codification
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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Professional and contract service expense includes cost reimbursements for support services related to contracted projects, outsourced management, technical and staff support.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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