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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2014
Asset Retirement Obligations  
Summary of activity in the Velardena Properties ARO

 

                                                                                                                                                                                         

 

 

Six Months Ended

 

 

 

June 30,

 

 

 

2014

 

2013

 

 

 

(in thousands)

 

Beginning balance

 

$
2,467

 

$
2,080

 

 

 

 

 

 

 

Changes in estimates, and other

 
(85

)
203

 

Accretion expense

 
98

 
88

 

Ending balance

 

$
2,480

 

$
2,371