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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2012
Commitments and Contingencies [Abstract]  
Summary of minimum rental commitments under operating and capital leases
                 
    Operating     Capital  
     Leases     Leases  
Year Ending December 31,   (In thousands)  

2013

   $ 1,796     $ 322  

2014

     1,763       42  

2015

     2,026       —    

2016

     2,039       —    

2017

     2,952       —    

2018 and thereafter

     7,255       —    
   

 

 

    

 

 

  

Minimum lease payments

     17,831       364  

Less amount representing interest

     —         15  
   

 

 

    

 

 

  
    $ 17,831     $ 349