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Intangible Assets (Schedule of future amortization expense for amortizable intangible assets) (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
2019 $ 10
2020 42
2021 42
2022 42
2023 42
Thereafter 74
Total $ 252