Schedule of Disaggregation of Revenue (Details) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Voyage charter revenues	$ 17,485	$ 22,709
Short-term Time Charter Contracts [Member]
Disaggregation of Revenue [Line Items]
Voyage charter revenues	$ 2,864	$ 11,319

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details