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Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 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
49

Revision in estimated cash flows
1

Liabilities settled
(2
)
Asset retirement obligations at June 30, 2012
$
1,641