XML 111 R16.htm IDEA: XBRL DOCUMENT v2.4.0.8
Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2013
Asset Retirement Obligations [Abstract]  
Asset Retirement Obligations

NOTE 8 —  ASSET RETIREMENT OBLIGATIONS

 

The total undiscounted amount of future cash flows to settle our asset retirement obligations is estimated to be $352.5 million and $275.0 million at December 31, 2013 and 2012. Payments to settle asset retirement obligations occur over the lives of the gas properties and other plant, property and equipment, estimated to be from less than one year to 45 years.

 

 

Changes in the asset retirement obligations are presented in the following table:

 

 

 

 

 

 

 

 

 

 

 

Year Ended

 

 

December 31, 2013

 

December 31, 2012

 

Beginning of period

$
126,991 

 

$
92,561 

 

Assumed in acquisitions

 
13,409 

 

 
14,581 

 

Revisions to previous estimates (1)

 
12,911 

 

 
17,278 

 

Liabilities incurred

 
360 

 

 
1,185 

 

Liabilities settled

 
(5,806)

 

 
(4,262)

 

Accretion expense

 
7,456 

 

 
5,648 

 

End of period

$
155,321 

 

$
126,991 

 

Less: Current portion of asset retirement obligations

 
4,310 

 

 
1,426 

 

Asset retirement obligations - non current

$
151,011 

 

$
125,565 

 

 

(1)

In 2013 and 2012, we recorded an upward revision to previous estimates for our asset retirement obligations primarily due to changes in the estimated abandonment dates.