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WARRANTY (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Warranty liability at beginning of year $ 17,659 $ 12,471
Provision for warranty liabilities 7,773 5,256
Warranty payments made (5,899) (3,743)
Warranty liability at March 31 $ 19,533 $ 13,984
Minimum [Member]
   
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Length of Limited Warranty, Term 0 years  
Maximum [Member]
   
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Length of Limited Warranty, Term 10 years