Lease Commitments (Details) $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Capital leased assets, Number of vessels	27
Proceeds from Sale of Property, Plant, and Equipment	$ 20,026	$ 0
Interest and finance costs	14,652	8,905
Depreciation	59,781	43,243
OCC vessels
Capital lease obligations incurred	$ 65,250
SK Shipholding S.A. \| Star Pisces
Description of Capital leases, Term of contract	Bareboat charter for seven years
Vessel purchase price obligation	$ 7,628
Proceeds from Sale of Property, Plant, and Equipment	$ 19,125
Capital leases, Date	April 2019
Ocean Trust Co. Ltd. \| Star Libra
Description of Capital leases, Term of contract	Bareboat charter for seven years
Vessel purchase price obligation	$ 18,107
Proceeds from Sale of Property, Plant, and Equipment	$ 33,950
Capital leases, Date	July 2019
Kyowa Sansho Co. Ltd. \| Star Challenger
Description of Capital leases, Term of contract	Bareboat charter for eleven years
Proceeds from Sale of Property, Plant, and Equipment	$ 15,000
NIBC $32,000 Facility
Extinguishment of Debt, Amount	11,671
HSH Nordbank AG $35,000 Facility
Extinguishment of Debt, Amount	10,874
Vessels under bareboat leases
Capital leased assets, gross amount	783,634
Capital leased assets, Accumulated depreciation	51,481
Depreciation	12,688	$ 7,319
Capital lease, early prepayment fee	1,399
Write off of Deferred Debt Issuance Cost	$ 25

Amount of fee for early prepayment of finance lease.

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Purchase price payable at the end of the bareboat charter.

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Amount of increase in lease obligation from new lease.

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The number of units (items of property) under capital lease arrangements.

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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 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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A general description of the lessee's leasing arrangements including, but not limited to, the following: a) the basis on which contingent rental payments are determined; (b) the existence and terms of renewal or purchase options and escalation clauses; (c) restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

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Gross amount of debt extinguished.

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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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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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

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