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Stockholders' Equity, Dividends (Details) (USD $) | 6 Months Ended | 23 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2014 Common Class A [Member] | Jun. 30, 2013 Common Class A [Member] | Dec. 31, 2013 Common Class A [Member] | Jun. 30, 2014 Redeemable Convertible Series 6.3% Preferred Stock [Member] | Jun. 30, 2013 Redeemable Convertible Series 6.3% Preferred Stock [Member] | Dec. 31, 2013 Redeemable Convertible Series 6.3% Preferred Stock [Member]
Cash Dividends [Abstract] |  |  |  |  |  |
Cash dividends paid, net of reinvested stock dividends | $ 2,525,000 | $ 2,146,000 |  |  |  |
Annualized dividend rate (in dollars per share) | $ 0.543 |  |  |  |  |
Preferred stock dividend rate percentage (in hundredths) |  |  |  | 6.30% |  | 6.30%
Cash dividends paid |  |  |  | 54,000 | 54,000 |
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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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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