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Debt - Convertible Bond Debt (Details)
Mar. 25, 2022
USD ($)
$ / shares
shares
Nov. 24, 2021
$ / shares
Jul. 29, 2019
USD ($)
vessel
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     $ 114,100,000
Interest Rate Swap detail     5.00%
Debt issuance costs     $ 1,600,000
Cash dividends per share (in dollars per share) | $ / shares $ 2.05 $ 2.00  
Conversion premium (in shares) | shares 27.606    
Conversion price (in dollars per share) | $ / shares $ 36.22    
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
Convertible Bond Debt      
Debt Instrument [Line Items]      
Net proceeds     112,500,000
Conversion premium per principal amount of notes $ 1,000   $ 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%