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Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2013
Asset Retirement Obligation [Abstract]  
Reconciliation of the company's asset retirement obligation
A reconciliation of the Company's liability, which is included in other accrued liabilities and other liabilities on the Consolidated Balance Sheets, for the years ended December 31 was as follows:

 
2013

2012

 
(In thousands)
Balance at beginning of year
$
102,545

$
98,151

Liabilities incurred
5,610

6,523

Liabilities acquired


Liabilities settled
(22,257
)
(10,472
)
Accretion expense
4,574

4,266

Revisions in estimates
7,671

3,655

Other
386

422

Balance at end of year
$
98,529

$
102,545