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Fair Value Measurements Fair Market Value of Liabilities (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Debt financing $ 194,267,900 $ 177,948,000
Mortgages payable 46,558,021 39,119,507
Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Debt financing 194,267,900 177,948,000
Mortgages payable 46,558,021 39,119,517
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Debt financing 194,658,641 179,103,291
Mortgages payable $ 47,553,226 $ 40,203,943