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Common Stock Common Stock (Equity Issuances) (Details) - shares
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]    
Common Stock, Shares Authorized 200,000,000 200,000,000
Sales Agency Agreement [Member]    
Class of Stock [Line Items]    
Common Stock, Shares Authorized 3,800,000  
Common Stock Shares Authorized Under Sales Agency Agreements Remaining Shares Authorized To Sell 1,100,000