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
Mar. 31, 2020
Mar. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Asset retirement obligation, beginning of period $ 60,355 $ 79,952
Liabilities incurred 381 969
Liabilities settled 0 (71)
Liabilities removed due to divestitures (2,033) 0
Accretion expense 741 1,067
Revisions in estimated cash flows 0 983
Asset retirement obligation as of end of period $ 59,444 $ 82,900