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Secured Borrowings - Summary of Scheduled Principal Payments (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Debt Disclosure [Abstract]  
October 1, 2019 - December 31, 2019 $ 1,175
2020 4,844
2021 73,419
2022 4,292
2023 4,512
Thereafter 222,329
Total $ 310,571