Real Estate - Held For Sale (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013 properties		Jun. 30, 2012 properties		Jun. 30, 2013 properties		Jun. 30, 2012 properties		Mar. 31, 2013 properties	Dec. 31, 2012 properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number Of Properties Classified As Held For Sale	29				29				15	10
Land and improvements	$ 19,438				$ 19,438					$ 9,937
Building and improvements	35,437				35,437					17,566
Work in process	1,193				1,193					72
Real Estate Held-for-sale	56,068				56,068					27,575
Less accumulated depreciation and amortization	(2,410)				(2,410)					(2,347)
Less impairment	(6,967)				(6,967)					(4,920)
Inventory, Real Estate, Held-for-sale	46,691				46,691					20,308
Number of Sold Properties	7	[1]	7	[1]	9	[1]	10	[1]
Gain (loss) on disposition of assets noncontrolling interest portion discontinued operations	153		0		153		0
Gain on disposition of real estate	2,669		2,438		3,174		2,752
Assets Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposition of real estate	$ 2,516	[1]	$ 2,438	[1]	$ 3,021	[1]	$ 2,752	[1]

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