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Product Warranties
 9 Months Ended
Sep. 30, 2016
Product Warranties Disclosures [Abstract]  
PRODUCT WARRANTIES
PRODUCT WARRANTIES
Changes in the Company’s accrual for product warranty claims during the first nine months of 2016 and 2015, including customer satisfaction settlements, were as follows:
 
(Thousands of dollars)
 
 
 
 
2016
 
2015
Balance at January 1
$
31,878

 
$
27,723

Charges to expense
25,391

 
28,021

Settlements
(25,330
)
 
(27,182
)
Balance at September 30
$
31,939

 
$
28,562


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, 2015.