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Accrued Warranty Costs (Tables)
6 Months Ended
Jun. 30, 2012
Accrued Warranty Costs [Abstract]  
Product warranty obligation
                                 
    

Six Months Ended

June 30,

    Three Months Ended
June 30,
 
  2012     2011     2012     2011  
        (In Thousands)        

Balance at beginning of period

  $ 5,370     $ 3,996     $ 5,616     $ 4,284  

Amounts charged to costs and expenses

    3,344       3,234       1,776       1,607  

Costs incurred

    (2,636     (2,632     (1,314     (1,293
   

 

 

   

 

 

   

 

 

   

 

 

 

Balance at end of period

  $ 6,078     $ 4,598     $ 6,078     $ 4,598