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Other non-current assets (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
SalesContract
Dec. 31, 2018
USD ($)
Other non-current assets [Abstract]    
Port access rights $ 11,977 $ 12,671
Initial lease costs 9,753 9,200
Nonrefundable deposit 16,445 10,810
Upfront payments to customers 6,267 0
Contract asset (Note 4) 9,997 0
Cost to fulfill (Note 4) 6,991 0
Other 3,865 2,574
Total other non-current assets $ 65,295 $ 35,255
Number of sales contracts | SalesContract 2  
Payments made to contracts under agreement $ 5,000  
Additional payments made to contracts under agreement $ 1,350