Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2011

Reconciliation of Asset Retirement Obligations which are Included in Other Liabilities

The following table reconciles our AROs for the periods presented, which are included in the Other liabilities caption on our Consolidated Balance Sheets:

	As of December 31,
	2011			2010
Balance at beginning of year	$	7,364		$	6,835
Liabilities incurred		214			126
Liabilities settled		(183	)		(41	)
Sale of properties		(1,611	)		-
Accretion expense		499			444
Balance at end of year	$	6,283		$	7,364