Debt - Convertible Bond Debt (Details)		12 Months Ended
Jul. 29, 2019 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) vessel
Debt Instrument [Line Items]
Number of vessels acquired \| vessel		6
Convertible Notes Payable \| Convertible Debt
Debt Instrument [Line Items]
Aggregate principal amount	$ 114,100,000
Stated interest rate	5.00%
Debt issuance costs	$ 1,600,000	$ 900,000
Conversion premium \| shares	178.1737
Conversion price (in dollars per share) \| $ / shares	$ 5.61
Proceeds attributed to the equity component		21,100,000
Debt, interest expense		$ 1,500,000
Convertible Notes Payable \| Convertible Debt \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption price percentage	100.00%
Convertible Notes Payable \| Convertible Debt \| Other Liabilities
Debt Instrument [Line Items]
Debt issuance costs	$ 1,000,000.0
Convertible Debt Securities
Debt Instrument [Line Items]
Net proceeds	112,500,000
Conversion premium per principal amount of notes	$ 1,000
Credit Default Option \| Unsecured Debt
Debt Instrument [Line Items]
Amount of principal amount eligible for declaration in case of default	25.00%
Amount of notes to be due and payable	100.00%

Debt Instrument, Convertible, Conversion Premium

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- Definition

Debt Instrument, Convertible, Convertible Per Principal Amount

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- Definition

Default Event, Amount Of Notes Outstanding To Declare All Outstanding Notes Payable

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No definition available.

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Default Event, Amount Of Notes Subject To Become Due

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- Definition

Vessel Acquired

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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For a debtor, the aggregate gain (loss) recognized on the restructuring of payables arises from the difference between the book value of the debt before the restructuring and the fair value of the payments on the debt after restructuring is complete.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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