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Inventories (Tables)
 9 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Summary of Inventory
Inventories consisted of the following:
(Thousands of dollars)
 
September 30,
2016
 
December 31,
2015
Finished products - FIFO basis
 
$
188,771

 
$
159,774

Less LIFO reserve - finished products
 
(131,505
)
 
(102,849
)
Finished products - LIFO basis
 
57,266

 
56,925

Store merchandise for resale
 
90,673

 
94,925

Materials and supplies
 
4,603

 
4,056

Total inventories
 
$
152,542

 
$
155,906