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Inventories (Tables)
6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Summary of Inventory
Inventories consisted of the following:
(Thousands of dollars)
 
June 30,
2016
 
December 31,
2015
Finished products - FIFO basis
 
$
197,407

 
$
159,774

Less LIFO reserve - finished products
 
(140,417
)
 
(102,849
)
Finished products - LIFO basis
 
56,990

 
56,925

Store merchandise for resale
 
92,222

 
94,925

Materials and supplies
 
3,282

 
4,056

Total inventories
 
$
152,494

 
$
155,906