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Leases - Future Minimum Payments Under Non-cancellable Lease Obligations (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Leases [Abstract]  
2019 $ 6,282
2020 8,523
2021 7,152
2022 7,369
2023 7,628
Thereafter 22,561
Total lease payments 59,515
Less: imputed interest (11,065)
Total lease liabilities (discounted) $ 48,450