ASSET RETIREMENT OBLIGATIONS (Tables)

6 Months Ended

Jun. 30, 2018

Asset Retirement Obligation [Abstract]

Schedule of Asset Retirement Obligations

The following table reflects the components of the change in the carrying amount of the asset retirement obligation for the six months ended June 30, 2018:

(in thousands)	Six Months Ended June 30, 2018
Asset retirement obligation at January 1, 2018	$	169,469
Liabilities incurred	3,921
Liability settlements and disposals	(10,103		)
Accretion expense	3,712
Revisions of estimated liabilities	999
Asset retirement obligation at June 30, 2018	167,998
Less current obligation	(8,430		)
Long-term asset retirement obligation	$	159,568