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Stockholders' Equity (Dividends) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 44 Months Ended
--- | --- | --- | --- | ---
Jan. 23, 2012 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015
Cash Dividends [Abstract] |  |  |  |  |  |
Cash dividends paid, net of reinvested stock dividends |  |  |  | $ 3,292,000 | $ 3,830,000 |
Annualized dividend rate (in dollars per share) |  |  |  | $ 0.471 | $ 0.543 |
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 |  |  |  |  |
Payment of sales commission or dealer manager fee | $ 0 |  |  |  |  |
Notice period for amendments to Dividend Reinvestment Plan |  |  |  | 30 days |  |
Common stock issued under dividend reinvestment plan |  |  |  |  |  | $ 13,200,000
Common stock issued under dividend reinvestment plan (in shares) |  |  |  |  |  | 1,398,000
Redeemable Convertible Series 6.3% Preferred Stock [Member] |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |
Cash dividends paid |  | $ 0 | $ 13,000 | $ 0 | $ 65,000 |

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