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Asset Retirement Obligations Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 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 nine months ended September 30, 2017 (in thousands):
 
2017
Asset Retirement Obligations recorded as of January 1
$
32,256

Accretion
1,722

Liabilities incurred for new wells and facilities construction
242

Reductions due to sold wells and facilities
(601
)
Reductions due to plugged wells and facilities
(2,278
)
Revisions in estimates
1,391

Asset Retirement Obligations as of September 30
$
32,732