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Vessels - Cost of vessels under construction (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
Cost of vessels under construction  
Carrying amount at January 1, 2018 $ 114,759
Carrying amount at September 30, 2018 26,799
Vessels Under Construction [Member]  
Cost of vessels under construction  
At January 1, 2018 114,759
Additions 164,364
Transferred to vessels (252,323)
At September 30, 2018 26,799
Carrying amount at January 1, 2018 114,759
Carrying amount at September 30, 2018 $ 26,799