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Product Warranties
 9 Months Ended
Sep. 30, 2014
Product Warranties Disclosures [Abstract]  
PRODUCT WARRANTIES
PRODUCT WARRANTIES
Changes in the Company’s accrual for product warranty claims during the first nine months of 2014 and 2013, including customer satisfaction settlements, were as follows:
 
(Thousands of dollars)
 
 
 
 
2014
 
2013
Balance at January 1
$
26,755

 
$
22,710

Charges to expense
25,250

 
18,916

Settlements
(26,297
)
 
(18,936
)
Balance at September 30
$
25,708

 
$
22,690


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, 2013.