Discontinued Operations Discontinued Operations (Details Textuals) (Details)	9 Months Ended
	Sep. 30, 2013 Properties	Sep. 30, 2012 Properties
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold	12	26
Assets Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Real Estate Properties	1