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Advances for vessels under construction and acquisition of vessels (Details)
$ in Thousands
6 Months Ended
Jun. 28, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Property, Plant and Equipment [Line Items]      
Advances for vessels under construction and acquisition of vessels   $ 59,900 $ 48,574
OCC vessels | Financed by CSSC      
Property, Plant and Equipment [Line Items]      
Secured financing related to commitments payments $ 104,400    
Commitments for vessels under construction $ 103,844    
Capital leased assets, Number of vessels 3    
Description of Capital leases, Term of contract Bareboat charter for ten years    
Total aggregate remaining contracted price plus agreed additional amounts   95,700  
OCC vessels | Financed by CSSC | Per vessel      
Property, Plant and Equipment [Line Items]      
Capital lease obligation recognised $ 34,800    
Vessel purchase price obligation $ 10,440    
OCC vessels | Financed by CSSC | First OCC Vessel      
Property, Plant and Equipment [Line Items]      
Capital lease obligation recognised   4,350  
OCC vessels | Financed by CSSC | Second OCC Vessel      
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