Fair Value Measurements Fair Market Value of Liabilities (Details) (USD $)	Feb. 28, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Debt financing		$ 177,948,000	$ 112,673,000
Mortgages payable	7,500,000	39,119,507	35,464,455
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Debt financing		177,948,000	112,673,000
Mortgages payable		39,119,517	35,464,455
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Debt financing		179,103,291	115,106,332
Mortgages payable		$ 40,203,943	$ 36,585,329