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Management fees (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Management fees	$ 7,543,000	$ 7,604,000	$ 8,436,000
Ship Procurement Services S.A. ("SPS")
Management fees	7,543,000	7,604,000	7,985,000
Procurement services daily fee	295
Maryville Maritime Inc.
Management fees	$ 0	$ 0	$ 451,000

X

- Definition

The daily fee per vessel for procurement services.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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