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Guarantees and Product Warranties (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Changes in warranty liability balance      
Beginning Balance $ 63,355 $ 78,313  
Current period accruals 29,867 [1] 30,066 [1]  
Current period settlements (26,371) (34,058)  
Ending Balance 66,851 74,321  
Guarantees and Product Warranties (Textuals)      
Carrying value of the bonds 11,900   11,900
Maximum future payment obligations 76,321   71,321
Standby letters of credit 23,435   22,623
Liability associated with guarantee $ 0   $ 0
[1] includes the impact of foreign exchange rate fluctuations