Summary of Significant Accounting Policies Schedule of Notes Receivable (Details) (USD $)			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Colonial Promenade Smyrna	Jun. 30, 2012 Colonial Promenade Fultondale Y
Notes Receivable
Note terms, years				5
Notes receivable, net	$ 42,761,000		$ 24,800,000	$ 16,700,000
Receivable acquired date			May 2010	February 2009
Annual interest rate, fixed			5.25%	5.60%
Guarantor obligations, maximum exposure			1,300,000
Receivable maturity date			Dec. 31, 2012
Accrued interest	300,000	300,000
Notes receivable, reserve	$ 0	$ 0
Weighted average interest rate	5.40%	4.90%