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Commitments, Contingencies and Legal Matters (Tables)
 12 Months Ended
Dec. 31, 2011
Commitments, Contingencies and Legal Matters [Abstract]  
Summary of changes in product warranties
     Year Ended December 31  
     2011      2010  
     (In thousands)  

Balance at the beginning of the period

    $ 17,617       $ 13,831   

Accruals for warranties issued during the period

      7,180         18,453   

Accruals related to pre-existing warranties (including changes in estimates)

      508         314   

Settlements made during the period (in cash or in kind)

      (8,138 )       (14,981 ) 
  

 

 

     

 

 

  

Balance at the end of the period

    $ 17,167       $ 17,617