Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2018

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

The following table presents the changes in carrying amounts of the asset retirement obligations associated with our working interests in crude oil and natural gas properties:

	Amount
	(in thousands)
Balance at December 31, 2017	$	87,306
Obligations incurred with development activities	620
Obligations incurred with acquisition	4,687
Accretion expense	1,288
Revisions in estimated cash flows	50
Obligations discharged with asset retirements and divestiture	(4,102		)
Balance at March 31, 2018	89,849
Less current portion	(15,944		)
Long-term portion	$	73,905