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		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Discontinued Operations
Revenues	$ 143	$ 50,315	$ 2,987	$ 151,373
Operating Expenses	(140)	(22,912)	(1,826)	(70,599)
Depreciation and Amortization, Discontinued Operations	(22)	(16,267)	(1,202)	(50,386)
Operating Income (Loss)	(19)	11,136	(41)	30,388
Interest Expense	(95)	(12,658)	(1,144)	(39,611)
Income (loss) before gain on sales	(114)	(1,522)	(1,185)	(9,223)
Earnings from depreciated property sales on discontinued operations	1,608	2,088	11,179	16,405
Income (loss) from discontinued operations	$ 1,494	$ 566	$ 9,994	$ 7,182