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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Table Text Block Supplement [Abstract]  
Changes In Asset Retirement Obligations
The following table summarizes the changes in our asset retirement obligations for the years ended December 31, 2014 and 2013:
 
 
Year Ended December 31,
In thousands
 
2014
 
2013
Beginning asset retirement obligations
 
$
126,301

 
$
106,430

Liabilities incurred and assumed during period
 
7,798

 
22,216

Revisions in estimated retirement obligations
 
(1,298
)
 
4,730

Liabilities settled and sold during period
 
(13,576
)
 
(15,523
)
Accretion expense
 
8,870

 
8,448

Ending asset retirement obligations
 
128,095

 
126,301

Less: current asset retirement obligations (1)
 
(1,684
)
 
(6,413
)
Long-term asset retirement obligations
 
$
126,411

 
$
119,888



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