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Subsequent Event (Narrative) (Details) - shares
Nov. 05, 2018
Sep. 30, 2018
Dec. 31, 2017
Subsequent Event [Line Items]      
Series D Preferred Stock, Shares Outstanding   3,404 0
Redeemable Preferred Stock [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Series D Preferred Stock, Shares Outstanding 3,404