Fair Value Measurements Fair Market Value of Liabilities (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Debt financing	$ 104,328,000	$ 112,673,000
Mortgages payable	43,231,990	40,092,455
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Debt financing	104,328,000	112,673,000
Mortgages payable	43,231,990	46,243,883
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Debt financing	105,590,417	115,106,332
Mortgages payable	$ 44,142,663	$ 46,932,670