Asset Retirement Obligation

6 Months Ended

Jun. 30, 2018

Asset Retirement Obligation Disclosure [Abstract]

ASSET RETIREMENT OBLIGATION

NOTE K—ASSET RETIREMENT OBLIGATION

Mine reclamation or future remediation costs for inactive mines are accrued based on management’s best estimate at the end of each period of the costs expected to be incurred at a site. Such cost estimates include, where applicable, ongoing care, maintenance and monitoring costs. Changes in estimates at inactive mines are reflected in earnings in the period an estimate is revised.

As of June 30, 2018, we had a liability of $19.8 million in other long-term obligations related to our asset retirement obligation. Changes in the asset retirement obligation (in thousands) during the six months ended June 30, 2018 are as follows:

	June 30,   2018
Beginning balance	$	19,032
Accretion	611
Additions and revisions of prior estimates	(487		)
Addition related to EPMH acquisition	2,733
Disposal related to sale of transloads	(2,116		)
Ending balance	$	19,773