Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations

Asset Retirement Obligations
6 Months Ended
Jun. 30, 2013
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations

The following table summarizes the Company’s asset retirement obligations activity for the six months ended June 30, 2013:
Asset retirement obligations at January 1, 2013

Accretion expense

Liabilities incurred

Liabilities settled
Revisions to estimate
Asset retirement obligations at end of period

Less: Current asset retirement obligations

Long-term asset retirement obligations at June 30, 2013

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 June 30, 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.