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Borrowings - Aggregate Maturities of Debt Obligations (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2019 $ 0  
2020 0  
2021 0  
2022 90,000  
2023 0  
Thereafter 110,000  
Total $ 200,000 $ 200,000