Earnings from Discontinued Operations (Summary of Communities Sold) (Details)	12 Months Ended
	Dec. 31, 2014 Property	Dec. 31, 2013 Property	Dec. 31, 2015 Property	Dec. 31, 2015 Communities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Sold	10	9
Number of Real Estate Properties			254	254