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Risk Management and Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Non-recurring Basis Long Lived Assets Held and Used and Held for Sale (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Significant Other Observable Inputs (Level 2) Northsea Alpha [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Fair value of vessel	$ 6,125
Impairment Loss charged against Vessels, net	1,142
Significant Other Observable Inputs (Level 2) Northsea Beta [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Fair value of vessel	6,125
Impairment Loss charged against Vessels, net	1,140
Significant Other Observable Inputs (Level 2) Northsea Alpha and Northsea Beta [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Fair value of vessel	12,250
Impairment Loss charged against Vessels, net	$ 2,282

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- Definition

Portion of impairment loss charged against vessels, net.

+ References

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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