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Summary of significant accounting policies - Right-of-Use Assets (Details)
$ in Thousands
Jan. 01, 2019
USD ($)
Right of use  
Closing balance as of December 31, 2018 $ 0
Initial recognition 204,937
Opening balance as of January 1, 2019 204,937
Lease liabilities  
Closing balance as of December 31, 2018 0
Initial recognition (204,937)
Reclassifications from Trade and other receivables, net 26,794
Opening balance as of January 1, 2019 $ (178,143)