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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.

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