Real Estate (Impairments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Impairment of assets	$ 34,634,000	$ 12,589,000	$ 13,778,000
Impairment of Real Estate	34,600,000	14,400,000	35,400,000
Impairment of long-lived assets to be disposed of or sold		1,800,000	22,600,000
Net Lease
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets to be disposed of or sold	3,600,000
Land and Residential Properties [Member]
Property, Plant and Equipment [Line Items]
Impairment of Real Estate	15,600,000
Real Estate Properties [Member]
Property, Plant and Equipment [Line Items]
Impairment of Real Estate	$ 15,400,000
Number of Properties Impaired	2