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Contingencies (Tables)
9 Months Ended
Sep. 30, 2011
Notes to Financial Statements [Abstract] 
Warranty Accrual Activity Table
Balance at December 31, 2010
 
$
7,038
 
Additions charged to costs and expenses
   
6,914
 
Deductions
   
(5,884
)
Other
   
14
 
Balance at September 30, 2011
 
$
8,082