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Warranty (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Warranty [Abstract]    
Warranty terms, minimum (in years) 1  
Warranty terms, maximum (in years) 4  
Changes in warranty reserve [Rollforward]    
Beginning balance $ 8,759 $ 7,043
Additions charged to expense 2,927 2,880
Foreign currency fluctuations 53 50
Claims paid (2,929) (2,590)
Ending balance $ 8,810 $ 7,383