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Charter arrangements - Shipping revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shipping Revenues [Abstract]      
Time charter revenues [1] $ 64,462 $ 100,310 $ 118,997
Voyage charter revenues [2] 311,480 254,742 234,646
Other shipping revenues 0 0 2,366
Shipping revenues $ 375,941 $ 355,052 $ 356,010
[1] Revenue in accordance with IAS 17 Leases
[2] 2018 revenue is presented in accordance with IFRS 15 Revenue from Contracts with Customers. The comparative information has not been restated.