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Description of the relevant terms of the derivative. Includes the type of instrument, risk being hedged, notional amount, counterparty, inception date, maturity date, relevant interest rates, strike price, cap price, and floor price.

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The number of derivative instruments of a particular group held by the entity.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Basis of Presentation and General Information (Details) $ in Thousands			6 Months Ended			7 Months Ended	8 Months Ended	9 Months Ended	12 Months Ended
	Jan. 14, 2019 USD ($) shares	Jan. 07, 2019	Jul. 06, 2018 USD ($) shares	Jun. 28, 2018 shares	Jun. 20, 2016	Aug. 03, 2018 USD ($) shares	Aug. 27, 2018 USD ($) shares	Oct. 10, 2018 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 17, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Date of Incorporation									Dec. 13, 2006
Number of vessels owned									107
Cash portion of the consideration									$ 328,634		$ 143,684	$ 396,154
Reverse stock split
Property, Plant and Equipment [Line Items]
Reverse stock split, Conversion ratio					5
OCC vessels
Property, Plant and Equipment [Line Items]
Number of vessels acquired				3
Number of shares issued as part of the final consideration \| shares				3,304,735
Songa Vessels
Property, Plant and Equipment [Line Items]
Number of vessels acquired			15
Number of shares issued as part of the final consideration \| shares			13,725,000
Augustea Vessels
Property, Plant and Equipment [Line Items]
Number of vessels acquired						16
Number of shares issued as part of the final consideration \| shares						10,277,335
Debt assumed						$ 308,279
Star Bright
Property, Plant and Equipment [Line Items]
DWT									55,783
Delivery date									October 10, 2018
Combined carrying capacity
Property, Plant and Equipment [Line Items]
DWT									11,700,000
Financed by China Merchants Bank Leasing \| Songa Vessels
Property, Plant and Equipment [Line Items]
Description of Capital leases, Term of contract									Bareboat charter for five years
Capital lease obligation recognised			$ 180,000
Cash portion of the consideration			$ 145,000
Step 1 Vessels
Property, Plant and Equipment [Line Items]
Number of shares issued as part of the final consideration \| shares							1,340,000
Number of operating vessels acquired							3
Cash portion of the consideration							$ 41,700
Step 1 Vessels \| Star Bright
Property, Plant and Equipment [Line Items]
Number of shares issued as part of the final consideration \| shares								291,300
Cash portion of the consideration								$ 9,167
Delivery date									Oct. 10, 2018
Step 2 Vessels
Property, Plant and Equipment [Line Items]
Dercription of terms of call and put options									The aggregate exercise price of the Call and Put Options is payable at the Company's option in either 2/3 cash and 1/3 common shares or 100% cash.
Call option \| Step 2 Vessels
Property, Plant and Equipment [Line Items]
Exercise date							Apr. 01, 2019
Number of instruments held							4
Call option \| Step 2 Vessels \| Per vessel
Property, Plant and Equipment [Line Items]
Exercise price							$ 28,850
Put option \| E.R. Capital Holding GmbH & Cie. KG \| Step 2 Vessels
Property, Plant and Equipment [Line Items]
Number of instruments held							4
Put option \| E.R. Capital Holding GmbH & Cie. KG \| Step 2 Vessels \| Per vessel
Property, Plant and Equipment [Line Items]
Exercise price							$ 26,350
ABN $115,000 Facility
Property, Plant and Equipment [Line Items]
Maximum borrowing capacity									$ 115,000
ABN $115,000 Facility \| Step 1 Vessels
Property, Plant and Equipment [Line Items]
Maximum borrowing capacity										$ 115,000
Loan agreement term										5 years
Subsequent Event \| Star Marianne
Property, Plant and Equipment [Line Items]
Delivery date		January 7, 2019
Subsequent Event \| Star Janni
Property, Plant and Equipment [Line Items]
Delivery date	January 14, 2019
Subsequent Event \| Step 1 Vessels \| Star Marianne and Star Janni
Property, Plant and Equipment [Line Items]
Number of shares issued as part of the final consideration \| shares	999,336
Cash portion of the consideration	$ 32,500
Minimum
Property, Plant and Equipment [Line Items]
DWT									52,055
Minimum \| Put option \| E.R. Capital Holding GmbH & Cie. KG \| Step 2 Vessels
Property, Plant and Equipment [Line Items]
Exercise date							Apr. 02, 2019
Maximum
Property, Plant and Equipment [Line Items]
DWT									209,537
Maximum \| Put option \| E.R. Capital Holding GmbH & Cie. KG \| Step 2 Vessels
Property, Plant and Equipment [Line Items]
Exercise date							Apr. 04, 2019