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WARRANTY (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Warranty liability at beginning of year $ 12,471 $ 9,169
Provision for warranty liabilities 27,127 19,795
Warranty payments made (21,939) (16,493)
Warranty liability at end of year $ 17,659 $ 12,471
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