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Warranty (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 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 2,300 2,927
Foreign currency fluctuations (81) 53
Claims paid (2,455) (2,929)
Ending balance $ 9,121 $ 8,810