Real Estate (Real Estate Available and Held for Sale) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 property	Dec. 31, 2014 USD ($)
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 288,021		$ 285,982
Residential Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale	134,100		155,800
Land
Real Estate Properties [Line Items]
Real estate available and held for sale	147,126		118,679
Commercial Operating Properties
Real Estate Properties [Line Items]
Property Transferred from HFS, Aggregate, Carrying Value	2,900
Condominium Units
Real Estate Properties [Line Items]
Number of properties acquired | property		1
Net Lease
Real Estate Properties [Line Items]
Real estate available and held for sale	2,708		4,521
Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale	138,187		$ 162,782
Construction Substantially Complete | Residential Units [Member]
Real Estate Properties [Line Items]
Property Transferred to Held for Sale, Aggregate, Carrying Value	30,000
Executed Contract with Third Party | Land
Real Estate Properties [Line Items]
Property Transferred to Held for Sale, Aggregate, Carrying Value	2,800
Executed Contract with Third Party | Net Lease
Real Estate Properties [Line Items]
Property Transferred to Held for Sale, Aggregate, Carrying Value	8,200
Executed Contract with Third Party | Residential Units [Member]
Real Estate Properties [Line Items]
Property Transferred to Held for Sale, Aggregate, Carrying Value	$ 3,900