Other non-current liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other non-current liabilities
Operating lease liability	$ 116,342	$ 112,818
Tax payable	19,888	19,706
Finance lease liability	16,624	17,109
Other	6,412	3,367
Total other non-current liabilities	$ 159,266	$ 153,000