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Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Contingencies - (Tables) [Abstract]  
Warranty Accrual Activity Table
A summary of the Company's warranty accrual activity is presented below (in thousands):

   
2011
  
2010
  
2009
 
Balance, beginning of year
 $7,038  $7,341  $9,885 
Additions charged to costs and expenses
  8,846   5,671   4,416 
Deductions
  (7,716)  (5,895)  (7,659)
Other
  (21)  (79)  699 
Balance, end of year
 $8,147  $7,038  $7,341