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Leases - Minimum lease payments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Minimum lease payments    
2019 (three months ending December 31) $ 3,284  
2020 9,224  
2021 7,551  
2022 7,186  
2023 7,390  
2024 7,601  
Thereafter 22,058  
Payments due 64,294  
Less: imputed interest (15,857)  
Operating lease liability $ 48,437  
Operating Leases, Future Minimum Payments, Due Thereafter   $ 27,777
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2019   5,458
2020   7,141
2021   7,168
2022   6,820
2023   7,024
Thereafter   27,777
Total   $ 61,388