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Commitments and contingencies - Future operating lease payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity  
2019 $ 10,996
2020 11,043
2021 11,461
2022 9,373
2023 9,429
2024 and thereafter 129,620
Future rental payments under operating leases $ 181,922