XML 67 R55.htm IDEA: XBRL DOCUMENT v3.10.0.1
ASSET RETIREMENT OBLIGATIONS (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Activity related to ARO liability  
Liability for asset retirement obligations at the beginning of the period $ 4,368
Liabilities settled and divested (110)
Additions 796
Acquisitions 2,465
Accretion expense 225
Revisions in estimated cash flows (632)
Liability for asset retirement obligations at the end of the period $ 7,112