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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015 and 2014:
 
 
Year Ended December 31,
In thousands
 
2015
 
2014
Beginning asset retirement obligations
 
$
128,095

 
$
126,301

Liabilities incurred and assumed during period
 
9,628

 
7,798

Revisions in estimated retirement obligations
 
5,238

 
(1,298
)
Liabilities settled and sold during period
 
(6,914
)
 
(13,576
)
Accretion expense
 
9,649

 
8,870

Ending asset retirement obligations
 
145,696

 
128,095

Less: current asset retirement obligations (1)
 
(6,777
)
 
(1,684
)
Long-term asset retirement obligations
 
$
138,919

 
$
126,411



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