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Leases - Maturities of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Operating leases    
2019 $ 2,346  
2020 3,140  
2021 3,152  
2022 3,164  
2023 3,176  
Thereafter 150,980  
Total principal and interest payments 165,958  
Less: present value discount (105,341)  
Present value of net minimum lease payments $ 60,617 $ 0