Asset Retirement Obligations Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2015

Asset Retirement Obligation Disclosure [Abstract]

Roll-forward of our asset retirement obligations

The following provides a roll-forward of our asset retirement obligations (in thousands):

Asset Retirement Obligations as of December 31, 2013	$	79,084
Accretion expense	5,712
Liabilities incurred for new wells and facilities construction	469
Reductions due to sold and abandoned wells and facilities	(8,253		)
Revisions in estimates	(4,181		)
Asset Retirement Obligations as of December 31, 2014	$	72,831
Accretion expense	5,572
Liabilities incurred for new wells and facilities construction	151
Reductions due to sold and abandoned wells and facilities	(4,576		)
Revisions in estimates	(10,423		)
Asset Retirement Obligations as of December 31, 2015	$	63,555