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Product Warranties (Tables)
 9 Months Ended
Sep. 30, 2018
Product Warranties Disclosures [Abstract]  
Changes in the Company's Accrual for Product Warranty Claims
Changes in the Company’s accrual for product warranty claims during the first nine months of 2018 and 2017, including customer satisfaction settlements, were as follows:
 
(Thousands of dollars)
 
 
 
 
2018
 
2017
Balance at January 1
$
151,425

 
$
34,419

Charges to expense
22,148

 
27,802

Settlements
(39,933
)
 
(41,408
)
Acquisition, divestiture and other adjustments
(66,236
)
 
107,321

Balance at September 30
$
67,404

 
$
128,134