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Vessels in Operation (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 18, 2018 USD ($)	Dec. 31, 2018 USD ($) Vessel	Dec. 31, 2017 USD ($) Vessel	Dec. 31, 2016 USD ($) Vessel	Nov. 15, 2018 Vessel
Property, Plant and Equipment [Line Items]
Vessel acquisition cost | $		$ 11,675
Number of vessels on which impairment charge is recognized		3	5	6
Vessel impairment charges | $		$ 71,834	$ 87,624	$ 92,422
Poseidon Transaction [Member]
Property, Plant and Equipment [Line Items]
Number of vessels purchased					20
GSL Valerie [Member]
Property, Plant and Equipment [Line Items]
Vessel delivery date		Jun. 18, 2018
Year built		2005
Capacity in TEUs		2,824
Vessel acquisition cost | $	$ 11,436
Argos [Member] | Poseidon Transaction [Member]
Property, Plant and Equipment [Line Items]
Number of vessels to be sold					1
Hayfin Credit Facility [Member]
Property, Plant and Equipment [Line Items]
Number of vessels pledged as collateral		1
Loan Facilities of Poseidon Fleet [Member]
Property, Plant and Equipment [Line Items]
Number of vessels pledged as collateral		19
2022 Notes [Member] | Citi Super Senior Term Loan [Member]
Property, Plant and Equipment [Line Items]
Number of vessels pledged as collateral		18

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Capacity Of Vessels In Twenty Foot Equivalent Units.

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The number of vessels on which impairment charge was recognized.

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The number of vessels purchased by the company.

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The number of vessels that the company agreed to sell in the near future.

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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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