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Operating leases - Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease costs $ 18,905 $ 7,417 $ 34,243 $ 23,274
Income from sub-leases (312) (268) (743) (781)
Net operating lease costs $ 18,593 $ 7,149 $ 33,500 $ 22,493