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Product Warranty Liabilities
 6 Months Ended
Jun. 30, 2011
Product Warranty Liabilities [Abstract]  
Product Warranty Liabilities
Product Warranty Liabilities
10.   The Company provides for the estimated cost of product warranties at the time revenue is recognized based primarily on historical return rates, estimates of the eligible tire population and the value of tires to be replaced. The following table summarizes the activity in the Company’s product warranty liabilities:
                 
    2010     2011  
Reserve at January 1
  $ 23,814     $ 24,924  
Additions
    9,813       19,213  
Payments
    (9,370 )     (13,648 )
 
           
Reserve at June 30
  $ 24,257     $ 30,489  
 
           
    The increase in the warranty provision is due primarily to increased truck and bus tire sales in the PRC and the increased prices of tires used to compute the warranty provision.