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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Operating Leases, Rent Expense, Net $ 0.1 $ 0.1 $ 0.3 $ 0.3