Discontinued Operations (Table Illustration of Discontinued Operations in Income Statement) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Discontinued Operations
Revenues	$ 365	$ 11,234	$ 3,485	$ 23,997
Operating expenses	(74)	(4,118)	(1,787)	(9,301)
Depreciation and amortization on discontinued operations	(55)	(3,049)	(351)	(6,692)
Operating income (loss)	236	4,067	1,347	8,004
Interest expense	(79)	(2,827)	(1,240)	(6,256)
Income before gain on sales	157	1,240	107	1,748
Gain on sale of depreciable properties	2,712	3,078	14,316	12,856
Income from discontinued operations	$ 2,869	$ 4,318	$ 14,423	$ 14,604