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Accrued Warranty Costs (Tables)
 3 Months Ended
Mar. 31, 2012
Accrued Warranty Costs [Abstract]  
Product warranty obligation
                 
    Three Months Ended
March 31,		  
    2012     2011  
    (In Thousands)  

Balance at beginning of period

   $ 5,370     $ 3,996  

Amounts charged to costs and expenses

     1,568       1,627  

Costs incurred

     (1,322 )      (1,339 ) 
   

 

 

    

 

 

  

Balance at end of period

   $ 5,616     $ 4,284