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Intangible Assets
 12 Months Ended
Dec. 31, 2011
Intangible Assets [Abstract]  
Intangible Assets

8.    Intangible Assets

Amounts recorded as intangible assets along with the balances and accumulated amortization at December 31, 2011 and 2010 are reflected in the table below:

 

                 
    December 31,
2011		     December 31,
2010		  
    (In thousands)  

Contract intangibles

   $ 89,420     $ 180,233  

Less accumulated amortization

     (14,258 )      (18,302 ) 
   

 

 

    

 

 

  

Net book value

   $ 75,164     $ 161,931  
   

 

 

    

 

 

  

 

                         
    For the years ended
December 31,		  
    2011     2010     2009  
    (In thousands)  

Total amortization expense on intangible assets

   $ 9,298     $ 10,150     $ 3,423  
   

 

 

    

 

 

    

 

 

  

The estimates of amortization expense for the periods as indicated below are based on current mining plans and are subject to revision as those plans change in future periods.

 

         

Estimated amortization expense (In thousands)

        

For year ended December 31, 2012

   $ 3,766  

For year ended December 31, 2013

     4,664  

For year ended December 31, 2014

     4,500  

For year ended December 31, 2015

     4,500  

For year ended December 31, 2016

     4,500