Real Estate And Accumulated Depreciation (Changes In Accumulated Depreciation; Including Real Estate Assets Held For Sale) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Real Estate And Accumulated Depreciation [Abstract]
Balance at beginning of period	$ 68,662	[1]	$ 51,638	[1]	$ 30,581
Depreciation	29,523		22,664		21,389
Depreciation on disposed property	(4,755)		(5,640)		(332)
Balance at end of period	93,430		68,662	[1]	51,638	[1]
Accumulated depreciation of real estate held for sale			3,716		6,350
Accumulated amortization of intangible lease assets			$ 591		$ 3,978

[1] Includes accumulated depreciation in real estate held for sale of $3,716 and $6,350 for 2010 and 2009, respectively. Excludes accumulated amortization related to intangible lease assets that are included in real estate held for sale of $591 and $3,978 for 2010 and 2009, respectively.