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Advances for vessels under construction and acquisition of vessels (Details) $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |
Advances for vessels under construction and acquisition of vessels | $ 0 | $ 59,900 | $ 48,574
OCC vessels | Financed by CSSC |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Capital leased assets, Number of vessels |  | 3 |
OCC vessels | First OCC Vessel | Financed by CSSC |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Capital lease obligation recognised |  | $ 4,350 |
OCC vessels | Second OCC Vessel | Financed by CSSC |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Capital lease obligation recognised |  | 4,350 |
Step 1 Acquisition |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Advances for vessels under construction and acquisition of vessels |  | $ 4,880 |

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