Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2014

Asset Retirement Obligation [Abstract]

Asset Retirement Obligation Transactions

Balance December 31, 2012	$	2,099
Accretion expense		120
Liabilities incurred		26
Liabilities settled		(417	)
Revision in estimated liabilities		(48	)
Balance December 31, 2013	$	1,780
Accretion expense		114
Liabilities incurred		46
Liabilities settled		(70	)
Revisions in estimated liabilities		138
Balance December 31, 2014	$	2,008