Quarterly report pursuant to Section 13 or 15(d)

PROPERTY AND EQUIPMENT (Schedule of Asset Retirement Obligation) (Details)

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PROPERTY AND EQUIPMENT (Schedule of Asset Retirement Obligation) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]        
Asset retirement obligation, beginning of period     $ 60,355 $ 79,952
Liabilities incurred     1,553 5,153
Liabilities settled     0 (117)
Liabilities removed due to divestitures     (2,033) 0
Accretion expense $ 755 $ 1,359 1,496 2,426
Revisions in estimated cash flows     0 1,077
Asset retirement obligation as of end of period $ 61,371 $ 88,491 $ 61,371 $ 88,491