Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2014

Asset Retirement Obligations [Abstract]

Schedule Of Change In Asset Retirement Obligation

		Six Months Ended
		June 30, 2014
Beginning of period	$	155,321
Assumed in acquisition		1,249
Divested		(186)
Revisions to previous estimates		690
Liabilities incurred		686
Liabilities settled		(1,270)
Accretion expense		4,313
End of period	$	160,803
Less: Current portion of asset retirement obligations		(4,356)
Asset retirement obligations - non-current	$	156,447