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Summary of significant accounting policies - Restatements of equity (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Total equity |  | $ 963,724 | $ 1,028,883 | [1] | $ 1,108,145 | [2] | $ 891,197 |
Total equity |  | 963,724 | 1,028,883 | [1] | 1,108,145 | [2] | 891,197 |
(Previously stated) |  |  |  |  |  |  |  |
Total equity |  |  |  |  |  |  | 891,197 |
Total equity |  |  |  |  |  |  | 891,197 |
Increase / (Decrease) |  |  |  |  |  |  |  |
Total equity | [3] |  |  |  |  |  | 0 |
Total equity | [3] |  |  |  |  |  | 0 |
Retained earnings |  |  |  |  |  |  |  |
Total equity |  | 8,671 | 18,728 |  | 49,247 | [2] | 106,209 |
Total equity |  | 8,671 | 18,728 |  | 49,247 | [2] | 106,209 |
Retained earnings | (Previously stated) |  |  |  |  |  |  |  |
Total equity |  |  | 206,669 |  | 237,188 |  | 294,150 |
Total equity |  |  | 206,669 |  | 237,188 |  | 294,150 |
Retained earnings | Increase / (Decrease) |  |  |  |  |  |  |  |
Total equity |  |  | (187,941) |  | (187,941) |  | (187,941) | [3]
Total equity |  |  | (187,941) |  | (187,941) |  | (187,941) | [3]
Cumulative translation adjustment |  |  |  |  |  |  |  |
Total equity |  | (555,044) | (492,374) |  | (478,096) | [2] | (364,663) |
Total equity |  | (555,044) | (492,374) |  | (478,096) | [2] | (364,663) |
Cumulative translation adjustment | (Previously stated) |  |  |  |  |  |  |  |
Total equity |  |  | (680,315) |  | (666,037) |  | (552,604) |
Total equity |  |  | (680,315) |  | (666,037) |  | (552,604) |
Cumulative translation adjustment | Increase / (Decrease) |  |  |  |  |  |  |  |
Total equity |  |  | 187,941 |  | 187,941 |  | 187,941 | [3]
Total equity |  |  | 187,941 |  | 187,941 |  | 187,941 | [3]
Subtotal |  |  |  |  |  |  |  |
Total equity |  | 925,041 | 988,269 |  | 1,063,636 | [2] | 861,821 |
Total equity |  | $ 925,041 | 988,269 |  | 1,063,636 | [2] | 861,821 |
Subtotal | (Previously stated) |  |  |  |  |  |  |  |
Total equity |  |  | 988,269 |  | 1,063,636 |  | 861,821 |
Total equity |  |  | 988,269 |  | 1,063,636 |  | 861,821 |
Subtotal | Increase / (Decrease) |  |  |  |  |  |  |  |
Total equity |  |  | 0 |  | 0 |  | 0 | [3]
Total equity |  |  | $ 0 |  | $ 0 |  | $ 0 | [3]
[1] | Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within shareholders equity of the initial application of IAS 29 as explained in Note 34.1.
[2] | Prior periods have been recast to reflect the Company's change in accounting policy for the classification of the adjustment of opening balance for the application of IAS 29 as explained in Note 34.
[3] | Prior periods have been recast to reflect the Company's change in accounting policy for the classification of the adjustment of opening balance for the application of IAS 29 as explained in Note 34.

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