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Commitments and Contigencies (Details) $ in Thousands	3 Months Ended	10 Months Ended	12 Months Ended
	Mar. 31, 2013 USD ($)	Nov. 05, 2014	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Coverage for pollution			$ 1,000,000
Variable portion of payment to SWS owner			6-month LIBOR of 1.83707%, and 3-month LIBOR of 1.69428% as of December 31, 2017, whichever is applicable
Due to related parties			$ 229	$ 356
Star Polaris | Arbitration proceedings
Loss Contingencies [Line Items]
Name of defendant			Hanjin HHIC-Phil Inc.
Off hire days	142
Revenue loss due to off hire	$ 2,343
Heron Convertible Loan
Loss Contingencies [Line Items]
Conversion ratio		0.5
Due to related parties			$ 0	$ 0

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Identifies the named defendant in a lawsuit.

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Maximum coverage per malpractice claim provided by the insurance arrangement.

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