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Stockholders' Equity, Dividends (Details) (USD $) | 9 Months Ended | 23 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014 Common Stock Series A [Member] | Sep. 30, 2013 Common Stock Series A [Member] | Dec. 31, 2013 Common Stock Series A [Member] | Aug. 31, 2014 Convertible Series 6.3% Preferred Stock [Member] | Sep. 30, 2014 Convertible Series 6.3% Preferred Stock [Member] | Sep. 30, 2014 Convertible Series 6.3% Preferred Stock [Member] | Dec. 31, 2013 Convertible Series 6.3% Preferred Stock [Member]
Cash Dividends [Abstract] |  |  |  |  |  |  |  |
Cash dividends paid, net of reinvested stock dividends |  | $ 3,830,000 | $ 3,345,000 |  |  |  |  |
Annualized dividend rate (in dollars per share) |  | $ 0.543 |  |  |  |  |  |
Preferred stock, dividend rate percentage (in hundredths) |  |  |  |  |  | 6.30% | 6.30% | 6.30%
Cash dividends paid |  |  |  |  |  |  | 77,000 |
Convertible series 6.3% preferred stock redeemed | 1,649,266 |  |  |  | 1,600,000 |  |  |
Dividend Reinvestment Plan [Abstract] |  |  |  |  |  |  |  |
Registered shares of common stock pursuant to dividend reinvestment plan (in shares) |  | 1,500,000 |  |  |  |  |  |
Percentage of purchase price per share (in hundredths) |  | 95.00% |  |  |  |  |  |
Former sales price per share (in dollars per share) |  | $ 9.50 |  |  |  |  |  |
Notice period for amendments to Dividend Reinvestment Plan |  | 30 days |  |  |  |  |  |
Common stock issued under dividend reinvestment plan |  |  |  | $ 7,900,000 |  |  |  |
Common stock issued under dividend reinvestment plan (in shares) |  |  |  | 836,000 |  |  |  |

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