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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019 and 2018:
 
 
Year Ended December 31,
In thousands
 
2019
 
2018
Beginning asset retirement obligations
 
$
176,585

 
$
166,310

Liabilities incurred and assumed during period
 
4,354

 
2,201

Revisions in estimated retirement obligations
 
9,206

 
2,298

Liabilities settled and sold during period
 
(24,342
)
 
(9,481
)
Accretion expense
 
15,957

 
15,257

Ending asset retirement obligations
 
181,760

 
176,585

Less: current asset retirement obligations(1)
 
(4,652
)
 
(2,115
)
Long-term asset retirement obligations
 
$
177,108

 
$
174,470



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