Earnings per Share (Narrative) (Details) - shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
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	5,000,000	5,100,000

- Definition

Specific terms relevant to convertibility. Includes class of preferred stock and number of shares convertible into, exercise (or conversion) price or rates, dates relevant to conversion timing and events relevant to conversion. Describe also any beneficial conversion features. where convertible preferred stock with a nondetachable conversion feature is in-the-money at commitment date. For contingently convertible preferred stock, discuss the circumstances of the contingency, including the events or changes in circumstance that would cause the contingency to be met and any of the significant features necessary to understand the conversion rights and the timing of those rights. Include also an events or changes in circumstance, if any, that could adjust or change the contingency, conversion price, or number of shares, including significant terms of those changes.

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