Real Estate and In-Place Lease Value (Narrative) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended		6 Months Ended			6 Months Ended
	Mar. 31, 2014 JointVenture	Jun. 30, 2014 JointVenture	Mar. 31, 2014 Retail Acquired in California [Member] sqft	Jun. 30, 2014 Retail Acquired in California [Member] sqft	Mar. 31, 2014 Vacant Lot Acquired in California [Member] acre	Jun. 30, 2014 Vacant Lot Acquired in California [Member] acre	Jun. 30, 2014 Maximum [Member]	Jun. 30, 2014 Maximum [Member] Building and Building Improvements [Member]	Mar. 31, 2014 Real Estate Investments in United Kingdom and Ireland [Member]	Jun. 30, 2014 KW Residential, LLC [Member] ApartmentBuildling apartment_unit	Jun. 30, 2014 Leases, Acquired-in-Place [Member]
Business Acquisition [Line Items]
Buildings and building improvements estimated lives								40 years
Acquired in-place lease estimated useful life											5 years 4 months
Number of Joint Venture Investments Consolidated	6	7
Number of properties acquired										50
Number of apartment units acquired										2,400
Equity method investment, ownership percentage							50.00%		50.00%	41.00%
Square foot of retail center acquired through foreclosure			133,000	133,000
Number of acre lot acquired by foreclosure					2.4	2.4
Acquisition related gain			$ 3.7