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Warranty (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Product Warranties Disclosures [Abstract]    
Warranty terms, minimum (in years) 1  
Warranty terms, maximum (in years) 4  
Changes in warranty reserve    
Beginning balance $ 9,357 $ 8,759
Additions charged to expense 8,239 9,384
Reserve divested 0 (236)
Foreign currency fluctuations (50) (37)
Claims paid (7,704) (8,647)
Ending balance $ 9,842 $ 9,223