Basis of Presentation and General Information (Policies)	6 Months Ended
Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting	The accompanying condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”), and the rules and regulations of the SEC that apply to interim financial statements and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all of the information and footnotes normally included in consolidated financial statements prepared in conformity with U.S. GAAP. They should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s 2019 Annual Report on Form 10-K, filed with the SEC on March 12, 2020.
Adoption of New Accounting Standards and Accounting Standards Issued But Not Yet Adopted	As of January 1, 2020, we adopted ASU No. 2016-13, "Financial Instruments—Credit Losses" ("ASU 2016-13"). ASU 2016-13 amended the current financial instrument impairment model by requiring entities to use a forward-looking approach based on expected losses to estimate credit losses on certain types of financial instruments, including trade receivables. The adoption of the accounting standard did not have any material impact on our condensed consolidated financial statements.
Use of Estimates	The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The significant estimates and assumptions of the Company are residual value of vessels, the useful lives of vessels, the value of stock-based compensation, estimated losses on our trade receivables, operating lease impairment, fair value of Convertible Bond Debt (as defined below) and its equity component, fair value of operating lease right-of-use assets and operating lease liabilities and the fair value of derivatives. Actual results could differ from those estimates.
Fair Value Measurements	Cash, cash equivalents and restricted cash—the carrying amounts reported in the Condensed Consolidated Balance Sheets for interest-bearing deposits approximate their fair value due to the short-term nature thereof. Debt—the carrying amounts of borrowings under the Norwegian Bond Debt, Convertible Bond Debt, Super Senior Facility, and the New Ultraco Debt Facility (prior to application of the discount and debt issuance costs) including the Revolving Loan, approximate their fair value, due to the variable interest rate nature thereof. The Company defines fair value, establishes a framework for measuring fair value and provides disclosures about fair value measurements. The fair value hierarchy for disclosure of fair value measurements is as follows: Level 1 – Quoted prices in active markets for identical assets or liabilities. Our Level 1 non-derivatives include cash, money-market accounts and restricted cash accounts. Level 2 – Quoted prices for similar assets and liabilities in active markets or inputs that are observable. Our Level 2 non-derivatives include our short-term investments and debt balances under the Convertible Bond Debt, Norwegian Bond Debt, Super Senior Facility, and the New Ultraco Debt Facility. Interest rate swaps are considered to be a Level 2 item as the Company, using the income approach to value the derivatives, uses observable Level 2 market inputs at measurement date and standard valuation techniques to convert future amounts to a single present amount assuming that participants are motivated, but not compelled to transact. Level 3 – Inputs that are unobservable (for example cash flow modeling inputs based on assumptions) As of June 30, 2020, the Company determined there were impairment indicators present for one of our chartered-in vessel contracts and, as a result, we recorded an operating lease impairment of $0.4 million. The operating lease impairment was included as a component of Operating (loss)/income in our Consolidated Statement of Operations for the three and six months ended June 30, 2020.

Basis of Presentation and General Information (Policies)

6 Months Ended

Jun. 30, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”), and the rules and regulations of the SEC that apply to interim financial statements and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all of the information and footnotes normally included in consolidated financial statements prepared in conformity with U.S. GAAP. They should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s 2019 Annual Report on Form 10-K, filed with the SEC on March 12, 2020.

Adoption of New Accounting Standards and Accounting Standards Issued But Not Yet Adopted

As of January 1, 2020, we adopted ASU No. 2016-13, "Financial Instruments—Credit Losses" ("ASU 2016-13"). ASU 2016-13 amended the current financial instrument impairment model by requiring entities to use a forward-looking approach based on expected losses to estimate credit losses on certain types of financial instruments, including trade receivables. The adoption of the accounting standard did not have any material impact on our condensed consolidated financial statements.

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The significant estimates and assumptions of the Company are residual value of vessels, the useful lives of vessels, the value of stock-based compensation, estimated losses on our trade receivables, operating lease impairment, fair value of Convertible Bond Debt (as defined below) and its equity component, fair value of operating lease right-of-use assets and operating lease liabilities and the fair value of derivatives. Actual results could differ from those estimates.

Fair Value Measurements

Cash, cash equivalents and restricted cash—the carrying amounts reported in the Condensed Consolidated Balance Sheets for interest-bearing deposits approximate their fair value due to the short-term nature thereof.

Debt—the carrying amounts of borrowings under the Norwegian Bond Debt, Convertible Bond Debt, Super Senior Facility, and the New Ultraco Debt Facility (prior to application of the discount and debt issuance costs) including the Revolving Loan, approximate their fair value, due to the variable interest rate nature thereof.

The Company defines fair value, establishes a framework for measuring fair value and provides disclosures about fair value measurements. The fair value hierarchy for disclosure of fair value measurements is as follows:

Level 1 – Quoted prices in active markets for identical assets or liabilities. Our Level 1 non-derivatives include cash, money-market accounts and restricted cash accounts.

Level 2 – Quoted prices for similar assets and liabilities in active markets or inputs that are observable. Our Level 2 non-derivatives include our short-term investments and debt balances under the Convertible Bond Debt, Norwegian Bond Debt, Super Senior Facility, and the New Ultraco Debt Facility. Interest rate swaps are considered to be a Level 2 item as the Company, using the income approach to value the derivatives, uses observable Level 2 market inputs at measurement date and standard valuation techniques to convert future amounts to a single present amount assuming that participants are motivated, but not compelled to transact.

Level 3 – Inputs that are unobservable (for example cash flow modeling inputs based on assumptions)

As of June 30, 2020, the Company determined there were impairment indicators present for one of our chartered-in vessel contracts and, as a result, we recorded an operating lease impairment of $0.4 million. The operating lease impairment was included as a component of Operating (loss)/income in our Consolidated Statement of Operations for the three and six months ended June 30, 2020.