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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2011
Intangible Assets [Abstract]  
Intangible assets
                 
    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  
   

 

 

   

 

 

   

 

 

 
Estimated amortization expense
         

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