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Fair value of Above / Below Market Acquired Time Charters (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 11, 2014	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortisation of fair value of above market time charters		$ 0	$ 0	$ 254
Amortisation of fair value of below market time charters		1,820	$ 0	0
Accumulated amortisation of fair value of below market time charters		$ 1,820
Weighted average remaining lease term		3 years 7 days
Madredeus And Amami | Above market time charters
Finite-Lived Intangible Assets [Line Items]
Assets fair value adjustment	$ 1,967
Amortisation of fair value of above market time charters				$ 254
Two Augustea Vessels | Below market time charters
Finite-Lived Intangible Assets [Line Items]
Liability recognized		$ 5,373

X

- Definition

Amount of non-cash amortization of intangible asset (liability) for above and below market leases.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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- Definition

Amount of amortization of acquired leases acquired as part of a real property acquisition at below market lease rate with a finite life.

+ References

No definition available.

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- Definition

Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties.

+ References

No definition available.

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- Definition

Amount of accumulated amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life.

+ References

No definition available.

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- Definition

Amount of acquired leases acquired as part of a real property acquisition at below market lease rate with a finite life.

+ References

No definition available.

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- Definition

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+ References

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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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