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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Supplemental Cash Flow Elements [Abstract]    
Accruals for the purchase of BWTS $ 420 $ 2,943
Accruals for dividends payable 1,639 785
Accruals for the purchase of vessels and vessel improvements $ 0 $ 70