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Asset Retirement Obligations
 6 Months Ended
Jun. 30, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation Disclosure
ASSET RETIREMENT OBLIGATIONS

The following table presents the changes in carrying amounts of the asset retirement obligations associated with our working interest in crude oil and natural gas properties:
 
Amount
 
(in thousands)
 
 
Balance at beginning of period, January 1
$
41,030

Obligations incurred with development activities
341

Accretion expense
1,716

Revisions in estimated cash flows
(134
)
Obligations discharged with divestitures of properties and asset retirements
(2,884
)
Balance end of period, June 30
40,069

Less: Current portion
(1,158
)
Long-term portion
$
38,911