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Asset Retirement Obligations Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Roll-forward of our asset retirement obligations
The following provides a roll-forward of our asset retirement obligations for the six months ended June 30, 2017 (in thousands):
 
2017
Asset Retirement Obligations recorded as of January 1
$
32,256

Accretion
1,140

Liabilities incurred for new wells and facilities construction
177

Reductions due to plugged wells and facilities
(1,904
)
Revisions in estimates
474

Asset Retirement Obligations as of June 30
$
32,143