Real Estate - Held For Sale (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended					3 Months Ended
	Mar. 31, 2013 properties		Dec. 31, 2012 properties	Mar. 31, 2012 properties		Mar. 31, 2013 Assets Held-for-sale [Member]		Mar. 31, 2012 Assets Held-for-sale [Member]		Dec. 31, 2012 Assets Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate held-for-sale reclassified to held-for-investment	15
Number Of Properties Classified As Held For Sale	13		23
Number Of Improved Properties Held for Sale	10		16
Number of Land Parcels Held for Sale	3		7
Land and improvements	$ 11,821		$ 11,419
Building and improvements	17,853		17,776
Work in process	600		72
Real Estate Held-for-sale	30,274		29,267
Less accumulated depreciation and amortization						(1,619)				(1,606)
Less impairment	(5,163)		(4,124)
Inventory, Real Estate, Held-for-sale	23,492		23,537
Number of Sold Properties	2	[1]		3	[1]
Gain on disposition of real estate						$ 505	[1]	$ 314	[1]

[1] None of the gains from property sales for the period were reported in continuing operations.