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Lease financing (Details Narrative) $ in Thousands | 3 Months Ended | 4 Months Ended | 6 Months Ended | 7 Months Ended | 8 Months Ended | 9 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Apr. 30, 2019 USD ($) | Jul. 10, 2019 USD ($) | Jul. 31, 2020 USD ($) | Jul. 31, 2019 USD ($) | Aug. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 29, 2020 USD ($) | Sep. 18, 2020 USD ($) | Nov. 17, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  |  |  |  |  |  | $ 708,910 | $ 623,892 | $ 875,037
DNB $310,000 Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  |  |  | $ 64,478 |  |  | 24,630 |  |
Repayment of debt |  |  |  |  |  |  |  |  |  |  | $ 41,982 |  |
Sinorure Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  |  | $ 47,782 |  | $ 9,258 |  |  |  |
HSH Nordbank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of debt |  |  | $ 10,874 |  |  |  |  |  |  |  |  |  | 11,958
NIBC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  |  |  |  |  |  |  | $ 11,671 |
Delphin Vessels [Member] | CMBL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Gross Proceeds, Financing Activities |  |  |  |  | $ 91,431 |  |  |  |  |  |  |  |
Description of Lessee Leasing Arrangements, Capital Leases |  |  |  |  |  |  |  |  |  |  | seven-year |  |
CMBL [Member] | Laura, Idee Fixe, Roberta, Kaley, Star Sirius and Star Vega [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Gross Proceeds, Financing Activities |  |  |  |  |  | $ 82,764 |  |  |  |  |  |  |
CMBL [Member] | Diva [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Gross Proceeds, Financing Activities |  |  |  |  |  |  |  |  |  | $ 7,236 |  |  |
CMBL [Member] | Laura, Idee Fixe, Roberta, Kaley, Diva, Star Sirius and Star Vega [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Lease Terms |  |  |  |  |  |  |  |  |  |  | five years |  |
CMBL [Member] | Delphin Vessels [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel purchase price obligation |  |  |  |  |  |  |  |  |  |  | $ 975 |  |
CMBL [Member] | Delphin Vessels [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel purchase price obligation |  |  |  |  |  |  |  |  |  |  | $ 3,379 |  |
CMBL [Member] | Delphin Scrubbers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Gross Proceeds, Financing Activities |  |  |  | $ 15,000 |  |  |  |  |  |  |  |  |
Number of repayment installments |  |  |  |  |  |  |  |  |  |  | 12 |  |
Frequency of periodic payment |  |  |  |  |  |  |  |  |  |  | quarterly |  |
CMBL [Member] | Songa Vessels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount received | $ 4,710 |  |  |  |  |  |  |  |  |  |  |  |
New Yangzijiang [Member] | Four Vessels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of lease liabilities |  |  |  |  |  |  |  |  |  |  | $ 51,060 |  |
S K Shipholding S. A. [Member] | Star Lutas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Gross Proceeds, Financing Activities |  |  |  |  |  |  |  |  | $ 16,000 |  |  |  |
Sale Leaseback Transaction, Lease Terms |  |  |  |  |  |  |  |  |  |  | seven-year bareboat charter |  |
Vessel purchase price obligation |  |  |  |  |  |  |  |  |  |  | $ 7,441 |  |
S K Shipholding S. A. [Member] | Star Pisces [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Gross Proceeds, Financing Activities |  | $ 19,125 |  |  |  |  |  |  |  |  |  |  |
Vessel purchase price obligation |  |  |  |  |  |  |  |  |  |  | $ 7,628 |  |
Description of Lessee Leasing Arrangements, Capital Leases |  |  |  |  |  |  |  |  |  |  | seven-year bareboat charter |  |
SPDB Financial Leasing Co. Ltd [Member] | Mackenzie, Kennadi, Honey Badger, Wolverine and Star Antares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Gross Proceeds, Financing Activities |  |  |  |  |  |  | $ 76,500 |  |  |  |  |  |
Sale Leaseback Transaction, Lease Terms |  |  |  |  |  |  |  |  |  |  | eight years |  |
SPDB Financial Leasing Co. Ltd [Member] | Mackenzie, Kennadi, Honey Badger, Wolverine and Star Antares [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel purchase price obligation |  |  |  |  |  |  |  |  |  |  | $ 7,776 |  |
SPDB Financial Leasing Co. Ltd [Member] | Mackenzie, Kennadi, Honey Badger, Wolverine and Star Antares [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel purchase price obligation |  |  |  |  |  |  |  |  |  |  | $ 7,916 |  |
ICBC Financial Leasing Co. Ltd [Member] | Gargantua Goliath And Maharaj [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Gross Proceeds, Financing Activities |  |  |  |  |  |  |  | $ 93,150 |  |  |  |  |
Sale Leaseback Transaction, Lease Terms |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Vessel purchase price obligation |  |  |  |  |  |  |  |  |  |  | $ 14,000 |  |
Kyowa Sansho Co. Ltd. [Member] | Star Fighter [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Gross Proceeds, Financing Activities |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,125
Vessel purchase price obligation |  |  |  |  |  |  |  |  |  |  | $ 2,450 |  |
Description of Lessee Leasing Arrangements, Capital Leases |  |  |  |  |  |  |  |  |  |  | ten years |  |
Kyowa Sansho Co. Ltd. [Member] | Star Challenger [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Gross Proceeds, Financing Activities |  |  | $ 15,000 |  |  |  |  |  |  |  |  |  |
Description of Lessee Leasing Arrangements, Capital Leases |  |  |  |  |  |  |  |  |  |  | eleven-year bareboat charter party contract |  |
Ocean Trust Co. Ltd. [Member] | Star Libra [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Gross Proceeds, Financing Activities |  |  |  |  | $ 33,950 |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Lease Terms |  |  |  |  |  |  |  |  |  |  | seven-year bareboat charter |  |
Vessel purchase price obligation |  |  |  |  |  |  |  |  |  |  | $ 18,107 |  |

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