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Contingencies (Tables)
 6 Months Ended
Jun. 30, 2012
Notes to Financial Statements [Abstract]  
Warranty Accrual Activity Table
Balance at December 31, 2011
 
$
8,147
 
Additions charged to costs and expenses
   
4,876
 
Deductions
   
(4,372
)
Other
   
(39
)
Balance at June 30, 2012
 
$
8,612