Discontinued Operations and Assets Held for Sale (Table Illustration of Discontinued Operations in Income Statement) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Discontinued Operations
Revenues	$ 5,019	$ 7,973
Operating Expenses	(1,687)	(3,221)
Depreciation and Amortization, Discontinued Operations	(2,665)	(4,166)
Operating Income (Loss)	667	586
Interest Expense	(1,366)	(2,312)
Income (loss) before gain on sales	(699)	(1,726)
Gains on depreciated property sales on discontinued operations	8,954	6,476
Income (loss) from discontinued operations	$ 8,255	$ 4,750