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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
7. Asset Retirement Obligations
The following table sets forth asset retirement obligations for the years ended December 31, 2013 and 2012:
 
 
Year Ended December 31,
 
 
2013
 
2012
 
 
(In thousands)
Asset retirement obligations at beginning of period
 
$
6,159

 
$
8,324

Liabilities incurred
 
3,348

 
1,573

Liabilities settled
 
(498
)
 
(1,666
)
Reduction due to sales of oil and gas properties
 
(2,473
)
 
(3,272
)
Accretion expense
 
471

 
372

Revisions of previous estimates
 
349

 
828

Asset retirement obligations at end of period
 
7,356

 
6,159

Asset retirement obligations due within one year included in “Other accrued liabilities”
 
(780
)
 
(1,670
)
Long-term asset retirement obligations
 
$
6,576

 
$
4,489