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Debt - Maturity Schedule (Details) - Notes Payable - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2019 $ 5,999  
2020 25,272  
2021 308  
2022 323  
2023 14,569  
Total $ 46,471 $ 47,329