Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2012

Asset Retirement Obligation [Abstract]

Asset Retirement Obligation Transactions

Balance December 31, 2010	$	1,437
Accretion expense		96
Liabilities incurred		57
Liabilities settled		(165	)
Revision in estimated liabilities		502
Balance December 31, 2011	$	1,927
Accretion expense		132
Liabilities incurred		92
Liabilities settled		(52	)
Revisions in estimated liabilities		-
Balance December 31, 2012	$	2,099