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Lease financing: (Details Narrative) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Lessor, Lease, Description [Line Items]
Depreciation	$ 69,958	$ 59,781
Variable portion of payments for bareboat lease obligations	3-month LIBOR of 0.302%
Songa And Delphin Scrubbers [Member] | CMBL [Member]
Lessor, Lease, Description [Line Items]
Amount drawn down	$ 16,983
Sale leaseback transaction, Remaining borrowing capacity	2,727
Assets Held under Capital Leases [Member]
Lessor, Lease, Description [Line Items]
Interest Expense, Lessee, Assets under Capital Lease	8,771	14,652
Capital Leases, Balance Sheet, Assets by Major Class, Net	707,940
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	82,542
Depreciation	15,747	12,688
Payments for Leasing Costs	53	1,399
Write off of Deferred Debt Issuance Cost	$ 541	$ 25

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- Definition

Amount of borrowing capacity currently available under the transaction involving the sale of property to another party and the lease of the property back to the seller.

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The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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The reference rate for the variable rate of the lessee's capital lease, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The amount, during the lease term, of each minimum [capital] lease payment allocated to interest expense so as to produce a constant periodic rate of interest on the remaining balance of the capital lease obligation.

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Amount of cash outflow for costs that are essential to originate the lease and would not otherwise have been incurred without the lease agreement. Amount includes, but is not limited to, cash outflows to evaluate the lessee's credit condition, guarantees, and collateral and cash outflows for costs incurred in negotiating, processing, and executing the lease agreement.

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The cash inflow from proceeds received from lessor related to a long-term capital lease obligation.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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