Real Estate (Details 2) (USD $)	3 Months Ended		6 Months Ended			12 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Consolidated Rental Properties [Member]	Dec. 31, 2013 Consolidated Rental Properties [Member]	Jun. 30, 2014 Land [Member]	Jun. 30, 2014 Ground Lease [Member]	Jun. 30, 2013 Ground Lease [Member]	Jun. 30, 2014 Ground Lease [Member]	Jun. 30, 2013 Ground Lease [Member]	Jun. 30, 2014 Retail Site [Member]	Jun. 30, 2013 Retail Site [Member]	Jun. 30, 2014 Retail Site [Member]	Jun. 30, 2013 Retail Site [Member]
Amortization of Intangible Assets			$ 1,530,000	$ 1,216,000				$ 1,100,000	$ 1,000,000	$ 2,200,000	$ 1,400,000	$ 300,000	$ 100,000	$ 600,000	$ 200,000
Income Loss From Equity Method Investments Merger Expenses			6,200,000	53,000,000
Properties acquired			3		3
Property Units Acquired			772		772
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	265,400,000		265,400,000		249,610,000		15,790,000
Disposed Properties			1		1
Disposed Units			336		336
Proceeds From Sale Of Property			49,050,000		40,850,000	4,500,000,000	8,200,000
Net gain on sales of real estate properties	14,903,000	0	14,903,000	0
Net gain on sales of land parcels	$ 824,000	$ 14,616,000	$ 794,000	$ 14,616,000