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Earnings Per Share (Narrative) (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Earnings Per Share [Abstract]          
Convertible Preferred Stock, Shares Issuable upon Conversion     The Company's Class N preferred shares, each of which is convertible to 40 common shares, have the right to receive dividends or dividend equivalents should the Company declare dividends on its common stock.    
Class N preferred shares, each convertible to common shares         40
Anti-dilutive common shares 1,000,000 5,000,000 1,000,000 5,000,000