Real Estate Investments Business Acquisitions (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jan. 31, 2014	Feb. 14, 2014	Mar. 07, 2014 property		Dec. 31, 2014
Business Acquisition [Line Items]
Document Period End Date	Mar. 31, 2015
Purchase Price	$ 0	$ 186,044,000
Debt Assumed, Net of Premiums							78,049,000
Intangible Assets		14,979,000
Intangible Liabilities							5,892,000
Persimmon Place [Member]
Business Acquisition [Line Items]
Date Purchased			Jan. 31, 2014
Property Name			Persimmon Place
City/State			Dublin, CA
Property Type			Development
Ownership			100.00%
Purchase Price			14,200,000
Debt Assumed, Net of Premiums			0
Intangible Assets			0
Intangible Liabilities			0
Shops at Mira Vista [Member]
Business Acquisition [Line Items]
Date Purchased				Feb. 14, 2014
Property Name				Shops at Mira Vista
City/State				Austin, TX
Property Type				Operating
Ownership				100.00%
Purchase Price				22,500,000
Debt Assumed, Net of Premiums				319,000
Intangible Assets				2,329,000
Intangible Liabilities				291,000
Fairfield Portfolio [Member]
Business Acquisition [Line Items]
Date Purchased					Mar. 07, 2014	[1]
Property Name					Fairfield Portfolio (1)	[1]
City/State					Fairfield, CT	[1]
Property Type					Operating	[1]
Ownership					80.00%
Purchase Price					149,344,000	[1]
Non-controlling interest recorded, fair value					15,400,000
Number of real estate properties acquired					3
Debt Assumed, Net of Premiums					77,730,000	[1]
Intangible Assets					12,650,000	[1]
Intangible Liabilities					5,601,000	[1]
Partnership Interest [Member]
Business Acquisition [Line Items]
Non-controlling interest recorded, fair value	0	15,385,000
Mortgage loans assumed for the acquisition of real estate	$ 0	$ 78,049,000

[1] On March 7, 2014, the Company acquired an 80% controlling interest in the Fairfield Portfolio. As a result of consolidation, the Company recorded the non-controlling interest of approximately $15.4 million at fair value. The portfolio consists of three operating properties located in Fairfield, CT.