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Commitments and Contingencies - Minimum lease payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Future minimum lease payments due to the Company under property operating agreements  
2019 $ 5,288
2020 5,260
2021 5,238
2022 5,207
2023 5,224
2024 and thereafter 323,533
Total $ 349,750