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Inventories (Tables)
 6 Months Ended
Jun. 30, 2012
Inventory [Abstract]  
Changes In the Inventory Reserves
                                 
     Six Months Ended
June 30,		     Three Months Ended
June 30,		  
  2012     2011     2012     2011  
    (In Thousands)  

Balance at beginning of period

   $ 1,783     $ 1,793     $ 1,705     $ 1,775  

Provisions for losses

     44       279       39       294  

Write-offs and disposals

     (90 )      (84 )      (7 )      (81 ) 
   

 

 

    

 

 

    

 

 

    

 

 

  

Balance at end of period

   $ 1,737     $ 1,988     $ 1,737     $ 1,988