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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
CONDENSED CONSOLIDATED BALANCE SHEETS [Abstract]    
Unbilled voyage receivable (in dollars) $ 67,089 $ 74,355
Voyage receivables, allowance for credit losses 46 1,245
Vessels and other property, accumulated depreciation $ 317,249 $ 364,868
Common stock, shares authorized 100,000,000 100,000,000
Common stock, no par value $ 0 $ 0
Common stock, shares, issued 27,984,807 29,274,452
Common stock, shares, outstanding 27,984,807 29,274,452