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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Changes in 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