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Commitments and Contingencies - Future Minimum Lease Payments Under Capital Leases (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Capital Leases [Abstract]  
2018 $ 1,753
2019 1,766
2020 1,785
2021 1,843
2022 1,803
Thereafter 17,131
Capital leases future minimum payments due, total 26,081
Less: Amount representing interest 8,305
Present value of future lease payments $ 17,776