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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]          
Asset retirement obligation, beginning of period     $ 79,952 $ 75,100  
Liabilities incurred     5,769 1,468  
Liabilities settled     (117) (719)  
Liabilities removed due to divestitures     (30,035) 0  
Accretion expense $ 747 $ 1,037 3,173 3,056  
Revisions in estimated cash flows     1,077 (374)  
Asset retirement obligation as of end of period 59,819 78,531 59,819 78,531  
Less current portion 0 120 0 120  
Asset retirement obligation, long-term $ 59,819 $ 78,411 $ 59,819 $ 78,411 $ 79,952