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Stockholders' Equity (Dividends) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 23, 2012 | Dec. 31, 2015 | Dec. 31, 2014
Cash Dividends [Abstract] |  |  |
Cash dividends paid, net of reinvested stock dividends |  | $ 4,124,000 | $ 4,803,000
Annualized dividend rate (in dollars per share) |  | $ 0.400 | $ 0.471
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 |  | $ 13,900,000 |
Common stock issued under dividend reinvestment plan (in shares) |  | 1,465,000 |
Redeemable Convertible Series 6.3% Preferred Stock [Member] |  |  |
Cash Dividends [Abstract] |  |  |
Cash dividends paid |  | $ 0 | $ 65,000

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