Real Estate Investments (Details) (USD $)			12 Months Ended
	Dec. 31, 2011 Macquarie CountryWide Regency - DESCO LLC [Member]	Dec. 31, 2010 Macquarie CountryWide Regency - DESCO LLC [Member]	Dec. 31, 2012 Wholly Owned Properties [Member]	Dec. 31, 2011 Wholly Owned Properties [Member]	Dec. 31, 2010 Wholly Owned Properties [Member]	Dec. 31, 2012 Wholly Owned Properties [Member] Shops at Erwin Mill [Member]	Dec. 31, 2012 Wholly Owned Properties [Member] Shops at Erwin Mill - Operating Component [Member]	Dec. 31, 2012 Wholly Owned Properties [Member] Grand Ridge Plaza [Member]	Dec. 31, 2012 Wholly Owned Properties [Member] Grand Ridge Plaza - Operating Component [Member]	Dec. 31, 2012 Wholly Owned Properties [Member] Balboa Mesa Shopping Center [Member]	Dec. 31, 2012 Wholly Owned Properties [Member] Sandy Springs [Member]	Dec. 31, 2012 Wholly Owned Properties [Member] Uptown District [Member]	Dec. 31, 2011 Wholly Owned Properties [Member] Ocala Corners [Member]	Dec. 31, 2011 Wholly Owned Properties [Member] Oak Shade Town Center [Member]	Dec. 31, 2011 Wholly Owned Properties [Member] Tech Ridge Center [Member]	Dec. 31, 2011 Unconsolidated Properties [Member] Macquarie CountryWide Regency - DESCO LLC [Member]	May 04, 2011 Unconsolidated Properties [Member] Macquarie CountryWide Regency - DESCO LLC [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition						May 31, 2012		Jun. 21, 2012		Aug. 31, 2012	Dec. 21, 2012	Dec. 27, 2012	Jun. 02, 2011	Aug. 18, 2011	Sep. 26, 2011
Business Acquisition, Name of Acquired Entity						Shops at Erwin Mill		Grand Ridge Plaza		Balboa Mesa Shopping Center	Sandy Springs	Uptown District	Ocala Corners	Oak Shade Town Center	Tech Ridge Center
Business Acquisition Location, City and State						Durham, NC		Issaquah, WA		San Diego, CA	Sandy Springs, GA	San Diego, CA	Tallahassee, FL	Davis, CA	Austin, TX
Business Acquisition, Cost of Acquired Entity, Purchase Price			$ 187,984,000	$ 101,400,000		$ 5,800,000	$ 358,000	$ 20,000,000	$ 11,761,000	$ 59,500,000	$ 35,250,000	$ 81,115,000	$ 11,129,000	$ 34,871,000	$ 55,400,000
Noncash or Part Noncash Acquisition, Debt Assumed			30,467,000	31,292,000			0		12,810,000	0	17,657,000	0	5,937,000	12,456,000	12,899,000
Acquired Finite-lived Intangible Asset, Amount			20,651,000	8,563,000			0		2,346,000	9,711,000	2,761,000	5,833,000	1,724,000	2,320,000	4,519,000
Acquired Finite Lived Intangible Liability Amount			9,661,000	5,152,000			0		144,000	6,977,000	1,386,000	1,154,000	2,558,000	1,658,000	936,000
Accrual for Environmental Loss Contingencies			4,263,000	0			0		0	145,000	60,000	4,058,000	0	0	0
Equity Method Investment, Ownership Percentage	0.00%	16.35%															16.35%
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest			100.00%	100.00%	100.00%
Equity Method Investment Sold, Carrying Amount																18,800,000
Disposition Fee, Income Received from Sale of Real Estate																5,000,000
Consulting Fee, Income Recognized for Sale of Real Estate																1,000,000
Acquisition Costs, Period Cost			$ 1,200,000	$ 707,000	$ 448,000