Real Estate Investments Business Acquisitions (Details) (USD $)	3 Months Ended	0 Months Ended
	Mar. 31, 2014	Jan. 31, 2014 Persimmon Place [Member]	Feb. 14, 2014 Shops at Mira Vista [Member]	Mar. 07, 2014 Fairfield Portfolio [Member] property		Mar. 07, 2014 Partnership Interest [Member]	Mar. 31, 2013 Partnership Interest [Member]
Business Acquisition [Line Items]
Date Purchased		Jan. 31, 2014	Feb. 14, 2014	Mar. 07, 2014	[1]
Property Name		Persimmon Place	Shops at Mira Vista	Fairfield Portfolio (1)	[1]
City/State		Dublin, CA	Austin, TX	Fairfield, CT	[1]
Property Type		Development	Operating	Operating	[1]
Ownership		100.00%	100.00%	80.00%	[1]
Purchase price, pro rated portion				$ 56,600,000	[1]
Purchase Price	186,044,000	14,200,000	22,500,000	149,344,000	[1]
Non-controlling interest recorded, fair value				15,400,000	[1]	15,385,000	0
Number of real estate properties acquired				3
Debt Assumed, Net of Premiums	78,049,000	0	319,000	77,730,000	[1]
Intangible Assets	14,922,000	0	2,329,000	12,593,000	[1]
Intangible Liabilities	$ 5,925,000	$ 0	$ 291,000	$ 5,634,000	[1]

[1] On March 7, 2014, the Company acquired an 80% controlling interest in the Fairfield Portfolio and paid $56.6 million for its pro-rata share of the acquisition, net of debt and other liabilities assumed. 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.