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Commitments and Contigencies (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Future, minimum, non-cancellable charter revenue (1)
Loss Contingencies [Line Items]
Minimum contractual charter revenues	$ 76,604
Future, minimum, non-cancellable charter revenue (1) | Non-cancellable time charter agreements
Loss Contingencies [Line Items]
Minimum contractual charter revenues	57,005
Future, minimum, non-cancellable charter revenue (1) | Non-cancellable freight charter agreements
Loss Contingencies [Line Items]
Minimum contractual charter revenues	19,599
Future, minimum, charter-in hire payments (2)
Loss Contingencies [Line Items]
Commitments under existing charter-in agreements	14,659
Future, minimum, charter-in hire payments (2) | Non-cancellable time charter agreements
Loss Contingencies [Line Items]
Commitments under existing charter-in agreements	13,451
Future, minimum, charter-in hire payments (2) | Non-cancellable freight charter agreements
Loss Contingencies [Line Items]
Commitments under existing charter-in agreements	$ 1,208
Bareboat commitments charter hire (4)
Loss Contingencies [Line Items]
Variable portion of payment to SWS owner	3-month LIBOR rate of 2.33575%

X

- Definition

The reference rate for the variable rate of the lessee's capital lease, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
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-Publisher FASB
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-Section 50
-Paragraph 2
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- Definition

Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 4
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