Basis of Presentation	3 Months Ended
Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Note 1 — Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of Overseas Shipholding Group, Inc., a Delaware corporation (the “Parent Company”), and its wholly-owned subsidiaries (collectively, the “Company” or “OSG”, “we”, “us” or “our”), including Alaska Tanker Company (“ATC”) as of its March 12, 2020 acquisition date. The Company owns and operates a fleet of oceangoing vessels engaged primarily in the transportation of crude oil and refined petroleum products in the U.S. Flag trade. These financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. They do not include all of the information and notes required by generally accepted accounting principles in the United States. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair statement of the results have been included. Operating results for the three months ended March 31, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021 or for any other interim period. The condensed consolidated balance sheet as of December 31, 2020 has been derived from the audited financial statements at that date but does not include all of the information and notes required by generally accepted accounting principles in the United States for complete financial statements. For further information, refer to the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (“Form 10-K”). In March 2020, the World Health Organization declared the outbreak of a novel coronavirus (“COVID-19”) as a pandemic, which continues to affect the United States and the world. COVID-19 and its direct and indirect consequences have caused significant volatility in U.S. and international markets, and there is significant uncertainty around the breadth and duration of business disruptions related to COVID-19, as well as its impact on the U.S. and international economies. The COVID-19 pandemic is a dynamic and continuously evolving phenomenon and the ultimate severity of the outbreak, and its effect on the Company’s business in the future, is uncertain.

Basis of Presentation

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Note 1 — Basis of Presentation

The accompanying unaudited condensed consolidated financial statements include the accounts of Overseas Shipholding Group, Inc., a Delaware corporation (the “Parent Company”), and its wholly-owned subsidiaries (collectively, the “Company” or “OSG”, “we”, “us” or “our”), including Alaska Tanker Company (“ATC”) as of its March 12, 2020 acquisition date. The Company owns and operates a fleet of oceangoing vessels engaged primarily in the transportation of crude oil and refined petroleum products in the U.S. Flag trade.

These financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. They do not include all of the information and notes required by generally accepted accounting principles in the United States. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair statement of the results have been included. Operating results for the three months ended March 31, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021 or for any other interim period.

The condensed consolidated balance sheet as of December 31, 2020 has been derived from the audited financial statements at that date but does not include all of the information and notes required by generally accepted accounting principles in the United States for complete financial statements. For further information, refer to the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (“Form 10-K”).

In March 2020, the World Health Organization declared the outbreak of a novel coronavirus (“COVID-19”) as a pandemic, which continues to affect the United States and the world. COVID-19 and its direct and indirect consequences have caused significant volatility in U.S. and international markets, and there is significant uncertainty around the breadth and duration of business disruptions related to COVID-19, as well as its impact on the U.S. and international economies. The COVID-19 pandemic is a dynamic and continuously evolving phenomenon and the ultimate severity of the outbreak, and its effect on the Company’s business in the future, is uncertain.