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Stockholders' Equity (Dividends) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 23, 2012 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016
Cash Dividends [Abstract] |  |  |  |
Cash dividends paid, net of reinvested stock dividends |  | $ 2,174,000 | $ 2,011,000 |
Annualized dividend rate (in dollars per share) |  | $ 0.40 |  |
Dividend Reinvestment Plan [Abstract] |  |  |  |
Registered shares of common stock pursuant to dividend reinvestment plan (in shares) | 3,000,000 |  |  |
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 |  |  |  | $ 15,200,000
Common stock issued under dividend reinvestment plan (in shares) |  |  |  | 1,595,000

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