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Inventories (Tables)
 3 Months Ended
Mar. 31, 2012
Inventory [Abstract]  
Changes In the Inventory Reserves
                 
    Three Months Ended
March 31,		  
    2012     2011  
    (In Thousands)  

Balance at beginning of period

   $ 1,783     $ 1,793  

Provision for (realization of) losses

     5       (15 ) 

Write-offs and disposals

     (83 )      (3 ) 
   

 

 

    

 

 

  

Balance at end of period

   $ 1,705     $ 1,775