Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2014

Asset Retirement Obligations [Abstract]

Schedule Of Change In Asset Retirement Obligation

		Three Months Ended
		March 31, 2014
Beginning of period	$	155,321
Assumed in acquisition		772
Revisions to previous estimates		334
Liabilities incurred		113
Liabilities settled		(404)
Accretion expense		2,134
End of period	$	158,270
Less: Current portion of asset retirement obligations		(4,461)
Asset retirement obligations - non-current	$	153,809