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Warranty (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Product Warranties Disclosures [Abstract]    
Warranty terms, minimum 1 year  
Warranty terms, maximum 4 years  
Changes in warranty reserves    
Beginning balance $ 9,663 $ 9,357
Additions charged to expense 2,131 2,300
Foreign currency fluctuations 22 (81)
Claims paid (2,358) (2,455)
Ending balance $ 9,458 $ 9,121