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Product Warranties
9 Months Ended
Sep. 30, 2011
Product Warranties [Abstract] 
PRODUCT WARRANTIES
NOTE 5—PRODUCT WARRANTIES
Changes in the Company’s accrual for product warranty claims during the first nine months of 2011 and 2010, including customer satisfaction settlements, were as follows:
                 
(Thousands of dollars)   2011     2010  
Balance at January 1
  $ 23,103     $ 22,214  
Charges to expense
    23,177       14,315  
Settlements
    (19,507 )     (13,674 )
 
           
Balance at September 30
  $ 26,773     $ 22,855  
 
           
For further details on the Company’s accrual for product warranty claims, see Note 1 to the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2010.