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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Changes In Asset Retirement Obligations
The following table summarizes the changes in our asset retirement obligations for the years ended December 31, 2016 and 2015:
 
 
Year Ended December 31,
In thousands
 
2016
 
2015
Beginning asset retirement obligations
 
$
145,696

 
$
128,095

Liabilities incurred and assumed during period
 
5,383

 
9,628

Revisions in estimated retirement obligations
 
6,238

 
5,238

Liabilities settled and sold during period
 
(19,878
)
 
(6,914
)
Accretion expense
 
11,681

 
9,649

Ending asset retirement obligations
 
149,120

 
145,696

Less: current asset retirement obligations (1)
 
(2,313
)
 
(6,777
)
Long-term asset retirement obligations
 
$
146,807

 
$
138,919



(1)
Included in “Accounts payable and accrued liabilities” in our Consolidated Balance Sheets.