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Earnings Per Share (Narrative) (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
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   40  
Anti-dilutive common shares 1,000,000 5,100,000 4,200,000 2,000,000