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Warranty (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 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 6,312 6,310
Foreign currency fluctuations (17) 75
Claims paid 5,817 5,593
Reserve acquired   10
Ending balance $ 9,237 $ 7,845