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Inventories (Tables)
 6 Months Ended
Jun. 30, 2013
Inventory Disclosure [Abstract]  
Changes in Inventory Reserves

Changes in our inventory reserves are as follows:

 

     Six Months Ended
June 30,		     Three Months Ended
June 30,		  
     2013     2012     2013     2012  
           (In Thousands)        

Balance at beginning of period

    $ 2,793      $ 1,783      $ 2,506      $ 1,705   

Provisions for losses

      235        44        519        39   

Write-offs and disposals

      (519 )      (90 )      (516 )      (7 ) 
  

 

 

    

 

 

    

 

 

    

 

 

  

Balance at end of period

    $ 2,509      $ 1,737      $ 2,509      $ 1,737