Accounting for the Impairment or Disposal of Long-Lived Assets (Tables)

6 Months Ended

Jun. 30, 2012

Property, Plant and Equipment Impairment or Disposal [Abstract]

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]

	For the Three Months Ended						For the Six Months Ended
	June 30, 2012			June 30, 2011			June 30, 2012			June 30, 2011
Revenues	$	576		$	16,886		$	10,235		$	39,095
Operating expenses	(297		)	(7,033		)	(4,464		)	(16,670		)
Interest and other income	2			58			30			154
Interest expense	(77		)	(2,845		)	(1,706		)	(6,172		)
Depreciation and amortization	(88		)	(3,195		)	(245		)	(8,742		)
Income before gain on property dispositions	116			3,871			3,850			7,665
Gain on property dispositions	2,981			50,157			4,045			50,627
Income from discontinued operations	$	3,097		$	54,028		$	7,895		$	58,292