Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2014

Asset Retirement Obligation [Abstract]

Schedule Of Asset Retirement Obligations

		December 31,
		2014		2013
Asset retirement obligations at beginning of period	$	72,807	$	60,814
Accretion expense		6,571		5,171
Liabilities incurred		10,242		7,730
Liabilities acquired(1)		53,270		-
Liabilities divested(1)		(15,760)		-
Liabilities settled		(336)		(2,334)
Revisions of estimated liabilities		446		1,426
Asset retirement obligations at end of period		127,240		72,807
Less: current asset retirement obligations		(417)		(96)
Long-term asset retirement obligations	$	126,823	$	72,711