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

6 Months Ended

Jun. 30, 2013

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, 2013			June 30, 2012			June 30, 2013			June 30, 2012
Revenues	$	436		$	5,281		$	3,955		$	19,663
Operating expenses	(656		)	(2,173		)	(1,634		)	(8,049		)
Interest and other income	3			304			13			643
Interest expense	(135		)	(583		)	(491		)	(3,481		)
Depreciation and amortization	(320		)	(1,000		)	(1,103		)	(2,072		)
Income (loss) before gain on property dispositions	(672		)	1,829			740			6,704
Gain on property dispositions	7,625			2,981			49,338			4,045
Income from discontinued operations	$	6,953		$	4,810		$	50,078		$	10,749