Real Estate Investments Business Acquisitions (Details) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended								0 Months Ended				0 Months Ended				0 Months Ended				0 Months Ended				0 Months Ended				9 Months Ended				0 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jan. 31, 2014 Persimmon Place [Member]	Feb. 14, 2014 Shops at Mira Vista [Member]	Mar. 07, 2014 Fairfield Portfolio [Member] property		May 30, 2013 Willow Oaks Crossing [Member]		May 30, 2013 Willow Oaks Crossing [Member]		Jun. 02, 2014 Willow Oaks Crossing [Member]		Jun. 02, 2014 Willow Oaks Crossing [Member]		Jul. 15, 2014 Clybourn Commons [Member]		Jul. 15, 2014 Clybourn Commons [Member]		Sep. 10, 2014 Belmont Chase [Member]		Sep. 10, 2014 Belmont Chase [Member]		Sep. 19, 2014 City Line Market [Member]		Sep. 19, 2014 City Line Market [Member]		Jul. 23, 2013 Shoppes of Burnt Mills [Member]		Jul. 23, 2013 Shoppes of Burnt Mills [Member]		Sep. 30, 2014 Partnership Interest [Member]	Sep. 30, 2013 Partnership Interest [Member]	Mar. 07, 2014 Partnership Interest [Member]	Mar. 20, 2013 Macquarie Country Wide - Regency Iii, Llc [Member]	Mar. 20, 2013 Consolidated Entities [Member] Hilltop Village [Member]	Sep. 30, 2013 Consolidated Entities [Member] Hilltop Village [Member]	Sep. 30, 2013 Fixed Rate Mortgage Loans [Member] Consolidated Entities [Member] Hilltop Village [Member]
Business Acquisition [Line Items]
Document Period End Date			Sep. 30, 2014
Date Purchased						Jan. 31, 2014	Feb. 14, 2014	Mar. 07, 2014	[1]	May 30, 2013	[1]			Jun. 02, 2014	[1]			Jul. 15, 2014	[1]			Sep. 10, 2014	[1]			Sep. 19, 2014	[1]			Jul. 23, 2013	[1]
Property Name						Persimmon Place	Shops at Mira Vista	Fairfield Portfolio (1)	[1]	Preston Oaks	[1]			Willow Oaks Crossing	[1]			Clybourn Commons	[1]			Belmont Chase	[1]			CityLine Market	[1]			Shoppes of Burnt Mills	[1]
City/State						Dublin, CA	Austin, TX	Fairfield, CT	[1]	Dallas, TX	[1]			Concord, NC	[1]			Chicago, IL	[1]			Ashburn, VA	[1]			Dallas, TX	[1]			Silver Springs, MD	[1]
Property Type						Development	Operating	Operating	[1]	Operating	[1]			Development	[1]			Operating	[1]			Development	[1]			Development	[1]			Operating	[1]
Ownership						100.00%	100.00%	80.00%	[1]			100.00%	[1]			100.00%	[1]			100.00%	[1]			100.00%	[1]			100.00%	[1]			20.00%	[1]				24.95%
Purchase price, pro rated portion								$ 56,600,000	[1]
Purchase Price			217,599,000	40,600,000		14,200,000	22,500,000	149,344,000	[1]	27,000,000	[1]			3,342,000	[1]			19,000,000	[1]			4,300,000	[1]			4,913,000	[1]			13,600,000	[1]
Non-controlling interest recorded, fair value								15,400,000	[1]																										0	15,385,000
Number of real estate properties acquired								3
Debt Assumed, Net of Premiums	78,049,000		78,049,000		7,496,000	0	319,000	77,730,000	[1]			0	[1]			0	[1]			0	[1]			0	[1]			0	[1]			7,496,000	[1]
Intangible Assets	16,748,000	11,834,000				0	2,329,000	12,733,000	[1]	3,396,000	[1]			0	[1]			1,686,000	[1]			0	[1]			0	[1]			8,438,000	[1]
Intangible Liabilities	9,236,000		9,236,000		7,929,000	0	291,000	5,647,000	[1]			7,597,000	[1]			0	[1]			3,298,000	[1]			0	[1]			0	[1]			332,000	[1]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest																																						100.00%
Equity Method Investment, Amount Sold																																							7,600,000
Mortgage loans assumed for the acquisition of real estate, net of premiums																																		$ 78,049,000	$ 0					$ 7,500,000

[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.