Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations

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Asset Retirement Obligations
 3 Months Ended
Mar. 31, 2013
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligations

The following table summarizes the Company’s asset retirement obligations activity for the three months ended March 31, 2013:
Asset retirement obligations at January 1, 2013
 
$
13,301

Accretion expense
 
565

Liabilities incurred
 
569

Liabilities settled
 
(162
)
Revisions to estimate
 
25

Asset retirement obligations at end of period
 
14,298

Less: Current asset retirement obligations
 
2,802

Long-term asset retirement obligations at March 31, 2013
 
$
11,496



Certain of the Company’s operating agreements require that assets be restricted for future abandonment obligations. Amounts recorded on the Consolidated Balance Sheets as restricted investments were $3,800 at March 31, 2013. These investments include primarily U.S. Government securities, and are held in abandonment trusts dedicated to pay future abandonment costs for several of the Company’s crude oil and natural gas properties.