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Product Warranties
 3 Months Ended
Mar. 31, 2018
Product Warranties Disclosures [Abstract]  
PRODUCT WARRANTIES
PRODUCT WARRANTIES
Changes in the Company’s accrual for product warranty claims during the first three 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
6,437

 
6,076

Settlements
(4,488
)
 
(7,508
)
Balance at March 31
$
153,374

 
$
32,987


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, 2017.