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Long-Term Borrowings - Future Contractual Principal Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Future contractual principal payments on long term borrowings    
2019 $ 8  
2020 400,009  
2021 9  
2023 100,000  
Thereafter 100,000  
Total $ 600,026 $ 34