Debt - Convertible Bond Debt (Details)	Jul. 29, 2019 USD ($) vessel $ / shares shares
Debt Instrument [Line Items]
Number of vessels acquired \| vessel	6
Convertible Senior Notes due 2024 \| Convertible Debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 114,120,000
Interest Rate Swap detail	5.00%
Debt issuance costs	$ 1,600,000
Conversion premium (in shares) \| shares	0.1781737
Conversion price (in dollars per share) \| $ / shares	$ 5.61
Convertible Senior Notes due 2024 \| Convertible Debt \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption price percentage	100.00%
Convertible Senior Notes due 2024 \| Convertible Debt \| Other Liabilities
Debt Instrument [Line Items]
Debt issuance costs	$ 1,000,000.0
Convertible Bond Debt
Debt Instrument [Line Items]
Net proceeds	$ 112,500,000
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

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

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Default Event, Amount Of Notes Subject To Become Due

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- Definition

Vessel Acquired

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No definition available.

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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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- 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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