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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.