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General accounting principles - Condensed consolidated statement of financial position (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
ASSETS    
Accounts receivable and accrued revenues $ 40,998 $ 42,212
Capitalized voyage expenses 1,414 0
Current LIABILITIES    
Accounts payable and accrued expenses 25,039 17,427
Stockholders' Equity    
Accumulated deficit (294,346) (222,087)
Adjustment, IFRS 15 [Member]    
ASSETS    
Accounts receivable and accrued revenues 5,456 (7,437)
Capitalized voyage expenses (1,414) 1,888
Current LIABILITIES    
Accounts payable and accrued expenses 615 (815)
Stockholders' Equity    
Accumulated deficit 3,426 (4,734)
Restated Balance [Member]    
ASSETS    
Accounts receivable and accrued revenues   34,775
Capitalized voyage expenses   1,888
Current LIABILITIES    
Accounts payable and accrued expenses   16,613
Stockholders' Equity    
Accumulated deficit   $ (226,821)
Balance without adoption of IFRS 15 [Member]    
ASSETS    
Accounts receivable and accrued revenues 46,453  
Capitalized voyage expenses 0  
Current LIABILITIES    
Accounts payable and accrued expenses 25,655  
Stockholders' Equity    
Accumulated deficit $ (290,920)