Real Estate Investments Real Estate Investments (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Unconsolidated Properties [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Current Assets, Description	$ 82,000,000
Mortgage loans assumed for aquistion of real estate	57,385,000
Acquired Finite-lived Intangible Asset, Amount	10,681,000
Acquired Finite Lived Intangible Liability Amount	2,096,000
Wholly Owned Properties [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Current Assets, Description	101,400,000
Mortgage loans assumed for aquistion of real estate	31,292,000
Acquired Finite-lived Intangible Asset, Amount	8,563,000
Acquired Finite Lived Intangible Liability Amount	5,152,000
Acquisition Costs, Period Cost	707,000	448,000	0
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	100.00%		100.00%
Macquarie Countrywide Regency - DESCO LLC [Member]
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage	0.00%	16.35%
Macquarie Countrywide Regency - DESCO LLC [Member] | Unconsolidated Properties [Member]
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage	16.35%
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
Ocala Corners [Member] | Wholly Owned Properties [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	6/2/2011
Business Acquisition, Name of Acquired Entity	Ocala Corners
Business Acquisition Location, City and State	Tallahassee, FL
Business Acquisition, Purchase Price Allocation, Current Assets, Description	11,129,000
Mortgage loans assumed for aquistion of real estate	5,937,000
Acquired Finite-lived Intangible Asset, Amount	1,724,000
Acquired Finite Lived Intangible Liability Amount	2,558,000
Davis Oakshade [Member] | Wholly Owned Properties [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	8/18/2011
Business Acquisition, Name of Acquired Entity	Oak Shade Town Center
Business Acquisition Location, City and State	Davis, CA
Business Acquisition, Purchase Price Allocation, Current Assets, Description	34,871,000
Mortgage loans assumed for aquistion of real estate	12,456,000
Acquired Finite-lived Intangible Asset, Amount	2,320,000
Acquired Finite Lived Intangible Liability Amount	1,658,000
Glen Oak [Member] | Unconsolidated Properties [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	9/1/2010
Business Acquisition, Name of Acquired Entity	Glen Oak Plaza
Business Acquisition Location, City and State	Glenview, IL
Business Acquisition, Purchase Price Allocation, Current Assets, Description	18,000,000
Mortgage loans assumed for aquistion of real estate	7,880,000
Acquired Finite-lived Intangible Asset, Amount	1,508,000
Acquired Finite Lived Intangible Liability Amount	562,000
Willow Festival [Member] | Unconsolidated Properties [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	12/15/2010
Business Acquisition, Name of Acquired Entity	Willow Festival
Business Acquisition Location, City and State	Northbrook, IL
Business Acquisition, Purchase Price Allocation, Current Assets, Description	64,000,000
Mortgage loans assumed for aquistion of real estate	49,505,000
Acquired Finite-lived Intangible Asset, Amount	9,173,000
Acquired Finite Lived Intangible Liability Amount	1,534,000
Tech Ridge [Member] | Wholly Owned Properties [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	9/26/2011
Business Acquisition, Name of Acquired Entity	Tech Ridge Center
Business Acquisition Location, City and State	Austin, TX
Business Acquisition, Purchase Price Allocation, Current Assets, Description	55,400,000
Mortgage loans assumed for aquistion of real estate	12,899,000
Acquired Finite-lived Intangible Asset, Amount	4,519,000
Acquired Finite Lived Intangible Liability Amount	$ 936,000