Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2012

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation [Table Text Block]

Asset retirement obligations at December 31, 2011	$	1,593
Accretion	73
Revision in estimated cash flows	11
Liabilities incurred	14
Liabilities settled	(8		)
Asset retirement obligations at September 30, 2012	$	1,683