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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%