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Inventories (Tables)
 3 Months Ended
Mar. 31, 2013
Changes in Inventory Reserves

Changes in our inventory reserves are as follows:

 

     Three Months Ended  
     March 31,  
     2013     2012  
     (In Thousands)  

Balance at beginning of period

    $ 2,793      $ 1,783   

Provision for (realization of) losses

      (284 )      5   

Write-offs and disposals

      (3 )      (83 ) 
  

 

 

    

 

 

  

Balance at end of period

    $ 2,506      $ 1,705