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Guarantees and Product Warranties (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Changes in warranty liability balance      
Beginning Balance $ 81,751 $ 63,355  
Current period accruals 12,936 [1] 15,934 [1]  
Current period settlements (13,011) (14,608)  
Ending Balance 81,676 64,681  
Guarantees and Product Warranties (Textuals)      
Carrying value of the bonds 11,900   11,900
Maximum future payment obligations 101,250   80,662
Standby letters of credit 23,435   23,435
Liability associated with guarantee $ 0   $ 0
[1] includes the impact of foreign exchange rate fluctuations