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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017:
 
 
Year Ended December 31,
In thousands
 
2018
 
2017
Beginning asset retirement obligations
 
$
166,310

 
$
149,120

Liabilities incurred and assumed during period
 
2,201

 
2,698

Revisions in estimated retirement obligations
 
2,298

 
6,867

Liabilities settled and sold during period
 
(9,481
)
 
(5,617
)
Accretion expense
 
15,257

 
13,242

Ending asset retirement obligations
 
176,585

 
166,310

Less: current asset retirement obligations(1)
 
(2,115
)
 
(554
)
Long-term asset retirement obligations
 
$
174,470

 
$
165,756



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