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Guarantees and Product Warranties (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Changes in warranty liability balance      
Beginning Balance $ 81,751 $ 63,355  
Current period accruals 16,105 [1] 29,867 [1]  
Current period settlements (24,429) (26,371)  
Ending Balance 73,427 66,851  
Guarantees and Product Warranties (Textuals)      
Carrying value of the bonds 11,900   11,900
Maximum future payment obligations 83,592   80,662
Standby letters of credit 26,035   23,435
Liability associated with guarantee $ 0   $ 0
[1] includes the impact of foreign exchange rate fluctuations