Asset Retirement Obligation (Tables)

6 Months Ended

Jun. 30, 2018

Asset Retirement Obligation

Reconciliation of changes in asset retirement obligation

The following table is a reconciliation of changes in ARO (in thousands):

	Six Months Ended		Year Ended
	June 30, 2018		December 31, 2017
Asset retirement obligation, beginning balance	$	6,074	$	13,579
Liabilities added from escalating working interests		288		198
Sales		(347)		(8,416)
Settlements		—		(60)
Accretion expense		249		773
Asset retirement obligation, ending balance	$	6,264	$	6,074