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Significant accounting principles - Condensed consolidated statement of financial position (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
ASSETS    
Accounts receivable and accrued revenues [1],[2] $ 60,196 $ 42,212
Capitalized voyage expenses 1,633 0
Current liabilities    
Accounts payable and accrued expenses [1] 28,634 17,427
Stockholders' equity    
Accumulated deficit (285,383) (222,087)
Adjustment, IFRS 15 [Member]    
ASSETS    
Accounts receivable and accrued revenues 8,271 (7,437)
Capitalized voyage expenses (1,633) 1,888
Current liabilities    
Accounts payable and accrued expenses 602 (815)
Stockholders' equity    
Accumulated deficit 6,036 (4,734)
Restated Balance [Member]    
ASSETS    
Accounts receivable and accrued revenues 68,467 34,775
Capitalized voyage expenses 0 1,888
Current liabilities    
Accounts payable and accrued expenses 29,236 16,613
Stockholders' equity    
Accumulated deficit $ (279,347) $ (226,821)
[1] Amortized cost.
[2] Cash and cash equivalents include $638 thousand in restricted cash in 2018 and $322 thousand in 2017, including employee withholding tax.