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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Discontinued Operations
Revenues	$ 664	$ 48,064	$ 2,660	$ 100,791
Operating expenses	(389)	(22,015)	(1,629)	(47,641)
Depreciation and amortization on discontinued operations	(222)	(16,762)	(1,115)	(34,037)
Operating income (loss)	53	9,287	(84)	19,113
Interest expense	(302)	(13,111)	(995)	(27,729)
Loss before gain on sales	(249)	(3,824)	(1,079)	(8,616)
Earnings from depreciated property sales on discontinued operations	3,095	2,713	9,571	14,316
Income (Loss) from discontinued operations	$ 2,846	$ (1,111)	$ 8,492	$ 5,700