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Summary of Significant Accounting Policies (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Significant Accounting Policies [Line Items] |  |  |
Noncontrolling Interest, Ownership Percentage By Parent | 97.72% | 97.05% |
Estimated Current Market Interest Rate | 5.04% | 3.76% |
Amortization | $ 2,483,217 | $ 1,712,530 | $ 1,105,087
Common Stock, Dividends, Per Share, Declared | $ 1.64 | $ 1.60 | $ 1.60
Real Estate, Federal Income Tax Basis | $ 18,900,000 |  |
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life | 19 years 4 months 24 days |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 20 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |
Equipment and Fixtures [Member] | Minimum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Equipment and Fixtures [Member] | Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |

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