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Basis of Presentation - Intangible Asset Amortization Expense by Year (Details) - 5 Arches, LLC - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
2019 (3 months) $ 1,897  
2020 5,420  
2021 4,987  
2022 3,848  
2023 and thereafter 4,222  
Total Future Intangible Asset Amortization $ 20,374 $ 0