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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2014
Asset Retirement Obligation [Abstract]  
Schedule of Asset Retirement Obligations
The following is a reconciliation of our asset retirement obligations for the six months ended June 30, 2014:
(in thousands)
 
 
Asset retirement obligations at beginning of period
 
$
42,954

Activity during the period:
 
 
Liabilities incurred during the period
 
355

Liabilities settled during the period
 
(17
)
Adjustment to liability due to divestitures
 
(9
)
Accretion of discount
 
1,376

Asset retirement obligations at end of period
 
44,659

Less current portion
 
191

Long-term portion
 
$
44,468