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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]        
Asset retirement obligation, beginning of period     $ 60,355 $ 79,952
Liabilities incurred     2,343 5,769
Liabilities settled     0 (117)
Liabilities removed due to divestitures     (2,033) (30,035)
Accretion expense $ 774 $ 747 2,270 3,173
Revisions in estimated cash flows     0 1,077
Asset retirement obligation as of end of period $ 62,935 $ 59,819 $ 62,935 $ 59,819