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Summary of significant accounting policies - Accounting policies changed during the period, Profit and Loss (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Other operating income, net $ 104,232 $ 43,763 [1] $ 5,752 [1]
(Loss) / Profit before income tax (24,257) 9,983 [1] 27,175 [1]
Income tax benefit / (expense) 1,024 4,992 [1] (12,899) [1]
(Loss) / Profit for the year $ (23,233) $ 14,975 [1],[2],[3] $ 14,276 [1],[2],[3]
Basic earnings / (loss) per share (in dollars per share) $ (0.211) $ 0.109 [1] $ 0.095 [1]
Diluted earnings / (loss) per share from operations (in dollars per share) $ (0.211) $ 0.108 [1] $ 0.094 [1]
Previously stated      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Other operating income, net   $ 39,461 $ (8,297)
(Loss) / Profit before income tax   5,681 13,126
Income tax benefit / (expense)   6,068 (9,387)
(Loss) / Profit for the year   $ 11,749 $ 3,739
Basic earnings / (loss) per share (in dollars per share)   $ 0.083 $ 0.017
Diluted earnings / (loss) per share from operations (in dollars per share)   $ 0.082 $ 0.017
Increase/ (Decrease)      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Other operating income, net   $ 4,302 $ 14,049
(Loss) / Profit before income tax   4,302 14,049
Income tax benefit / (expense)   (1,076) (3,512)
(Loss) / Profit for the year   $ 3,226 $ 10,537
Basic earnings / (loss) per share (in dollars per share)   $ 0.026 $ 0.078
Diluted earnings / (loss) per share from operations (in dollars per share)   $ 0.026 $ 0.077
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.
[2] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.
[3] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.