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Number Of Vessels

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Amount of contractual obligation maturing in the remainder of the fiscal year following the latest fiscal year ended.

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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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Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.10)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Commitments and Contingencies - Additional Information - Samsung (Details) $ in Millions	1 Months Ended	12 Months Ended	24 Months Ended
	Jul. 31, 2017 newbuilding	Dec. 31, 2017 USD ($) newbuilding	Dec. 31, 2020 vessel	Jun. 30, 2018 USD ($)
Loss Contingencies [Line Items]
Number of newbuildings \| newbuilding	4
Samsung Heavy Industries Co., Ltd.
Loss Contingencies [Line Items]
Number of newbuildings \| newbuilding		4
Contractual obligation		$ 602.0
Prepaid Expense		$ 25.4
Payments due in the remainder of 2018				$ 52.0
Payments due in the year 2019				333.1
Payments due in the year 2020				$ 192.0
Scenario, Forecast [Member] \| Statoil ASA [Member]
Loss Contingencies [Line Items]
Number of vessels \| vessel			2