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Stockholders' Equity, Dividends (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Common Class A [Member] |  |
Cash Dividends [Abstract] |  |
Cash dividends paid, net of reinvested stock dividends | $ 4,578,000 | $ 4,262,000
Annualized dividend rate (in dollars per share) | $ 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 |
Notice period for amendments to Dividend Reinvesment Plan | 30 days |
Common stock issued under dividend reinvestment plan | 7,900,000 |
Common stock issued under dividend reinvestment plan (in shares) | 836,000 |
Redeemable Convertible Series 6.3% Preferred Stock [Member] |  |
Cash Dividends [Abstract] |  |
Cash dividends paid | $ 105,000 |

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- Definition The period of notice for an amendment, suspension or termination to the Dividend Reinvestment Plan prior to a designated dividend record date. + References No definition available. + Details
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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=6959260&loc=d3e187085-122770 + Details
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- Definition Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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