Fair Value Measurements Fair Market Value of Liabilities (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Mortgages payable and other secured financing	$ 69,053,487	$ 69,247,574
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Debt financing and unsecured LOCs	458,292,061	468,993,716
Mortgages payable and other secured financing	69,053,487	69,247,574
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Debt financing and unsecured LOCs	460,227,159	475,415,345
Mortgages payable and other secured financing	$ 68,999,002	$ 67,735,213